Desktop capture: Fix GN target and exclude differ* sources on iOS

Fix some out-of-sync differences between GYP and GN targets for
desktop capture.

Remove sources that aren't used on iOS for that platform, to solve
linking errors that surfaced when flipping iOS to GN by default.

BUG=webrtc:5949
NOTRY=True
TBR=sergeyu@chromium.org

Review-Url: https://codereview.webrtc.org/2289103002
Cr-Commit-Position: refs/heads/master@{#13971}
diff --git a/webrtc/modules/desktop_capture/BUILD.gn b/webrtc/modules/desktop_capture/BUILD.gn
index 735b460..61a3de2 100644
--- a/webrtc/modules/desktop_capture/BUILD.gn
+++ b/webrtc/modules/desktop_capture/BUILD.gn
@@ -38,13 +38,8 @@
     "desktop_capture_options.cc",
     "desktop_capture_options.h",
     "desktop_capturer.h",
-    "desktop_capturer.h",
     "desktop_frame_win.cc",
     "desktop_frame_win.h",
-    "differ.cc",
-    "differ.h",
-    "differ_block.cc",
-    "differ_block.h",
     "mac/desktop_configuration.h",
     "mac/desktop_configuration.mm",
     "mac/desktop_configuration_monitor.cc",
@@ -129,6 +124,15 @@
     ]
   }
 
+  if (!is_ios) {
+    sources += [
+      "differ.cc",
+      "differ.h",
+      "differ_block.cc",
+      "differ_block.h",
+    ]
+  }
+
   if (is_mac) {
     libs = [
       "AppKit.framework",
diff --git a/webrtc/modules/desktop_capture/desktop_capture.gypi b/webrtc/modules/desktop_capture/desktop_capture.gypi
index 024d826..872e705 100644
--- a/webrtc/modules/desktop_capture/desktop_capture.gypi
+++ b/webrtc/modules/desktop_capture/desktop_capture.gypi
@@ -9,9 +9,23 @@
 {
   'targets': [
     {
+      'target_name': 'primitives',
+      'type': 'static_library',
+      'sources': [
+        'desktop_capture_types.h',
+        'desktop_frame.cc',
+        'desktop_frame.h',
+        'desktop_geometry.cc',
+        'desktop_geometry.h',
+        'desktop_region.cc',
+        'desktop_region.h',
+      ],
+    },
+    {
       'target_name': 'desktop_capture',
       'type': 'static_library',
       'dependencies': [
+        ':primitives',
         '<(webrtc_root)/system_wrappers/system_wrappers.gyp:system_wrappers',
         '<(webrtc_root)/base/base.gyp:rtc_base',
       ],
@@ -21,93 +35,73 @@
         'cropping_window_capturer.cc',
         'cropping_window_capturer.h',
         'cropping_window_capturer_win.cc',
-        "desktop_and_cursor_composer.cc",
-        "desktop_and_cursor_composer.h",
-        "desktop_capture_types.h",
-        "desktop_capturer.h",
-        "desktop_frame.cc",
-        "desktop_frame.h",
-        "desktop_frame_win.cc",
-        "desktop_frame_win.h",
-        "desktop_geometry.cc",
-        "desktop_geometry.h",
-        "desktop_capture_options.h",
-        "desktop_capture_options.cc",
-        "desktop_capturer.h",
-        "desktop_region.cc",
-        "desktop_region.h",
-        "differ.cc",
-        "differ.h",
-        "differ_block.cc",
-        "differ_block.h",
-        "mac/desktop_configuration.h",
-        "mac/desktop_configuration.mm",
-        "mac/desktop_configuration_monitor.h",
-        "mac/desktop_configuration_monitor.cc",
-        "mac/full_screen_chrome_window_detector.cc",
-        "mac/full_screen_chrome_window_detector.h",
-        "mac/scoped_pixel_buffer_object.cc",
-        "mac/scoped_pixel_buffer_object.h",
-        "mac/window_list_utils.cc",
-        "mac/window_list_utils.h",
-        "mouse_cursor.cc",
-        "mouse_cursor.h",
-        "mouse_cursor_monitor.h",
-        "mouse_cursor_monitor_mac.mm",
-        "mouse_cursor_monitor_win.cc",
-        "mouse_cursor_monitor_x11.cc",
-        "screen_capture_frame_queue.h",
-        "screen_capturer.h",
-        "screen_capturer_helper.cc",
-        "screen_capturer_helper.h",
-        "screen_capturer_mac.mm",
-        "screen_capturer_win.cc",
-        "screen_capturer_x11.cc",
-        "shared_desktop_frame.cc",
-        "shared_desktop_frame.h",
-        "shared_memory.cc",
-        "shared_memory.h",
-        "win/cursor.cc",
-        "win/cursor.h",
-        "win/d3d_device.cc",
-        "win/d3d_device.h",
-        "win/desktop.cc",
-        "win/desktop.h",
-        "win/dxgi_adapter_duplicator.cc",
-        "win/dxgi_adapter_duplicator.h",
-        "win/dxgi_duplicator_controller.cc",
-        "win/dxgi_duplicator_controller.h",
-        "win/dxgi_output_duplicator.cc",
-        "win/dxgi_output_duplicator.h",
-        "win/dxgi_texture.cc",
-        "win/dxgi_texture.h",
-        "win/dxgi_texture_mapping.cc",
-        "win/dxgi_texture_mapping.h",
-        "win/dxgi_texture_staging.cc",
-        "win/dxgi_texture_staging.h",
-        "win/scoped_gdi_object.h",
-        "win/scoped_thread_desktop.cc",
-        "win/scoped_thread_desktop.h",
-        "win/screen_capturer_win_directx.cc",
-        "win/screen_capturer_win_directx.h",
-        "win/screen_capturer_win_gdi.cc",
-        "win/screen_capturer_win_gdi.h",
-        "win/screen_capturer_win_magnifier.cc",
-        "win/screen_capturer_win_magnifier.h",
-        "win/screen_capture_utils.cc",
-        "win/screen_capture_utils.h",
-        "win/window_capture_utils.cc",
-        "win/window_capture_utils.h",
-        "window_capturer.h",
-        "window_capturer_mac.mm",
-        "window_capturer_win.cc",
-        "window_capturer_x11.cc",
-        "x11/shared_x_display.h",
-        "x11/shared_x_display.cc",
-        "x11/x_error_trap.cc",
-        "x11/x_error_trap.h",
-        "x11/x_server_pixel_buffer.cc",
-        "x11/x_server_pixel_buffer.h",
+        'desktop_and_cursor_composer.cc',
+        'desktop_and_cursor_composer.h',
+        'desktop_capture_options.h',
+        'desktop_capture_options.cc',
+        'desktop_capturer.h',
+        'desktop_frame_win.cc',
+        'desktop_frame_win.h',
+        'mac/desktop_configuration.h',
+        'mac/desktop_configuration.mm',
+        'mac/desktop_configuration_monitor.h',
+        'mac/desktop_configuration_monitor.cc',
+        'mac/full_screen_chrome_window_detector.cc',
+        'mac/full_screen_chrome_window_detector.h',
+        'mac/scoped_pixel_buffer_object.cc',
+        'mac/scoped_pixel_buffer_object.h',
+        'mac/window_list_utils.cc',
+        'mac/window_list_utils.h',
+        'mouse_cursor.cc',
+        'mouse_cursor.h',
+        'mouse_cursor_monitor.h',
+        'mouse_cursor_monitor_mac.mm',
+        'mouse_cursor_monitor_win.cc',
+        'screen_capture_frame_queue.h',
+        'screen_capturer.h',
+        'screen_capturer_helper.cc',
+        'screen_capturer_helper.h',
+        'screen_capturer_mac.mm',
+        'screen_capturer_win.cc',
+        'shared_desktop_frame.cc',
+        'shared_desktop_frame.h',
+        'shared_memory.cc',
+        'shared_memory.h',
+        'win/cursor.cc',
+        'win/cursor.h',
+        'win/d3d_device.cc',
+        'win/d3d_device.h',
+        'win/desktop.cc',
+        'win/desktop.h',
+        'win/dxgi_adapter_duplicator.cc',
+        'win/dxgi_adapter_duplicator.h',
+        'win/dxgi_duplicator_controller.cc',
+        'win/dxgi_duplicator_controller.h',
+        'win/dxgi_output_duplicator.cc',
+        'win/dxgi_output_duplicator.h',
+        'win/dxgi_texture.cc',
+        'win/dxgi_texture.h',
+        'win/dxgi_texture_mapping.cc',
+        'win/dxgi_texture_mapping.h',
+        'win/dxgi_texture_staging.cc',
+        'win/dxgi_texture_staging.h',
+        'win/scoped_gdi_object.h',
+        'win/scoped_thread_desktop.cc',
+        'win/scoped_thread_desktop.h',
+        'win/screen_capture_utils.cc',
+        'win/screen_capture_utils.h',
+        'win/screen_capturer_win_directx.cc',
+        'win/screen_capturer_win_directx.h',
+        'win/screen_capturer_win_gdi.cc',
+        'win/screen_capturer_win_gdi.h',
+        'win/screen_capturer_win_magnifier.cc',
+        'win/screen_capturer_win_magnifier.h',
+        'win/window_capture_utils.cc',
+        'win/window_capture_utils.h',
+        'window_capturer.h',
+        'window_capturer_mac.mm',
+        'window_capturer_win.cc',
+
       ],
       'conditions': [
         ['OS!="ios" and (target_arch=="ia32" or target_arch=="x64")', {
@@ -115,7 +109,18 @@
             'desktop_capture_differ_sse2',
           ],
         }],
-        ['use_x11 == 1', {
+        ['use_x11==1', {
+          'sources': [
+            'mouse_cursor_monitor_x11.cc',
+            'screen_capturer_x11.cc',
+            'window_capturer_x11.cc',
+            'x11/shared_x_display.h',
+            'x11/shared_x_display.cc',
+            'x11/x_error_trap.cc',
+            'x11/x_error_trap.h',
+            'x11/x_server_pixel_buffer.cc',
+            'x11/x_server_pixel_buffer.h',
+          ],
           'link_settings': {
             'libraries': [
               '-lX11',
@@ -129,9 +134,17 @@
         }],
         ['OS!="win" and OS!="mac" and use_x11==0', {
           'sources': [
-            "mouse_cursor_monitor_null.cc",
-            "screen_capturer_null.cc",
-            "window_capturer_null.cc",
+            'mouse_cursor_monitor_null.cc',
+            'screen_capturer_null.cc',
+            'window_capturer_null.cc',
+          ],
+        }],
+        ['OS!="ios" ', {
+          'sources': [
+            'differ.cc',
+            'differ.h',
+            'differ_block.cc',
+            'differ_block.h',
           ],
         }],
         ['OS=="mac"', {
@@ -169,8 +182,8 @@
           'target_name': 'desktop_capture_differ_sse2',
           'type': 'static_library',
           'sources': [
-            "differ_block_sse2.cc",
-            "differ_block_sse2.h",
+            'differ_block_sse2.cc',
+            'differ_block_sse2.h',
           ],
           'conditions': [
             ['os_posix==1', {