update android build to use SDK API level 19.

BUG=1817

Review URL: https://codereview.chromium.org/88223002

git-svn-id: http://skia.googlecode.com/svn/trunk@12504 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/platform_tools/android/app/project.properties b/platform_tools/android/app/project.properties
index 0840b4a..4ab1256 100644
--- a/platform_tools/android/app/project.properties
+++ b/platform_tools/android/app/project.properties
@@ -11,4 +11,4 @@
 #proguard.config=${sdk.dir}/tools/proguard/proguard-android.txt:proguard-project.txt
 
 # Project target.
-target=android-15
+target=android-19