Add ability to generate/use FDO profiles for Android

R=scroggo@google.com, bungeman@google.com

Author: djsollen@google.com

Review URL: https://codereview.chromium.org/420803003
diff --git a/platform_tools/android/gyp_gen/makefile_writer.py b/platform_tools/android/gyp_gen/makefile_writer.py
index 436075c..c788827 100644
--- a/platform_tools/android/gyp_gen/makefile_writer.py
+++ b/platform_tools/android/gyp_gen/makefile_writer.py
@@ -198,6 +198,7 @@
     f.write(DEBUGGING_HELP)
 
     write_clear_vars(f)
+    f.write('LOCAL_FDO_SUPPORT := true\n')
     f.write('LOCAL_ARM_MODE := thumb\n')
 
     # need a flag to tell the C side when we're on devices with large memory