Update platform SDK component to revision 3. [DO NOT MERGE]

Also update LayoutLib Api version.

Change-Id: Ic64a548d171891100f043c3e1a823db22b11e71e
diff --git a/sdk/platform_source.prop_template b/sdk/platform_source.prop_template
index 626ed5a..39160b6 100644
--- a/sdk/platform_source.prop_template
+++ b/sdk/platform_source.prop_template
@@ -2,9 +2,9 @@
 Pkg.UserSrc=false
 Platform.Version=${PLATFORM_VERSION}
 Platform.CodeName=Jelly Bean
-Pkg.Revision=2
+Pkg.Revision=3
 AndroidVersion.ApiLevel=${PLATFORM_SDK_VERSION}
 AndroidVersion.CodeName=${PLATFORM_VERSION_CODENAME}
-Layoutlib.Api=9
+Layoutlib.Api=12
 Layoutlib.Revision=1
 Platform.MinToolsRev=21