Implement GpuArcVideoService for arc video accelerator

content/common/gpu/gpu_process_launch_causes.h

Index: content/common/gpu/gpu_process_launch_causes.h
diff --git a/content/common/gpu/gpu_process_launch_causes.h b/content/common/gpu/gpu_process_launch_causes.h
index 533a5943264b4d6bd81d6295aefe167233ee5372..0402e76ad9f5d3f98d7377c8f9405cdfd3da0474 100644
--- a/content/common/gpu/gpu_process_launch_causes.h
+++ b/content/common/gpu/gpu_process_launch_causes.h
@@ -8,6 +8,7 @@
 namespace content {
 
 // If you change this enum you also need to update
+// TODO(kcwu)

[Owen Lin, 2015/11/23 05:31:06]

I think we need this in the same CL.

[kcwu, 2015/11/23 08:11:48]

Yes, it was "TODO in this CL'.
Done.

 // tools/metrics/histograms/histograms.xml
 enum CauseForGpuLaunch {
   // Start enum from 2 to keep the same values for the histogram.
@@ -23,6 +24,7 @@ enum CauseForGpuLaunch {
   CAUSE_FOR_GPU_LAUNCH_GPU_MEMORY_BUFFER_ALLOCATE,
   CAUSE_FOR_GPU_LAUNCH_JPEGDECODEACCELERATOR_INITIALIZE,
   CAUSE_FOR_GPU_LAUNCH_MOJO_SETUP,
+  CAUSE_FOR_GPU_LAUNCH_ARCACCELERATOR,
 
   // All new values should be inserted above this point so that
   // existing values continue to match up with those in histograms.xml.