Use Android SDK from third_party/ for AppRTCMobile AAR-project.

Bug: webrtc:8365
Change-Id: Ic8116404a128189715625507423069e712ee6b0f
Reviewed-on: https://webrtc-review.googlesource.com/10807
Reviewed-by: Magnus Jedvert <magjed@webrtc.org>
Commit-Queue: Sami Kalliomäki <sakal@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20314}
diff --git a/examples/aarproject/.gitignore b/examples/aarproject/.gitignore
index bb4d335..e93eb88 100644
--- a/examples/aarproject/.gitignore
+++ b/examples/aarproject/.gitignore
@@ -1,7 +1,8 @@
 # Default ignores by Android Studio
 *.iml
 .gradle
-/local.properties
+# We want to specify our own SDK.
+# /local.properties
 /.idea/workspace.xml
 /.idea/libraries
 .DS_Store
diff --git a/examples/aarproject/app/build.gradle b/examples/aarproject/app/build.gradle
index 2d10aca..1dd1511 100644
--- a/examples/aarproject/app/build.gradle
+++ b/examples/aarproject/app/build.gradle
@@ -2,7 +2,7 @@
 
 android {
     compileSdkVersion 26
-    buildToolsVersion "26.0.1"
+    buildToolsVersion "26.0.0"
     defaultConfig {
         applicationId "org.appspot.apprtc"
         minSdkVersion 16
diff --git a/examples/aarproject/local.properties b/examples/aarproject/local.properties
new file mode 100644
index 0000000..ce50776
--- /dev/null
+++ b/examples/aarproject/local.properties
@@ -0,0 +1,2 @@
+# Use Android SDK from third_party/android_tools
+sdk.dir=../../third_party/android_tools/sdk