Merge Group Markers into Chromium Traces.

cc/raster/scoped_gpu_raster.cc

Index: cc/raster/scoped_gpu_raster.cc
diff --git a/cc/raster/scoped_gpu_raster.cc b/cc/raster/scoped_gpu_raster.cc
index f548515b6985084a5ef6fc7b016c3d3e4c00e727..e6dcf231ba2dcda9036566c79c34e9c2651b54aa 100644
--- a/cc/raster/scoped_gpu_raster.cc
+++ b/cc/raster/scoped_gpu_raster.cc
@@ -27,7 +27,7 @@ void ScopedGpuRaster::BeginGpuRaster() {
   // TODO(alokp): Use a trace macro to push/pop markers.
   // Using push/pop functions directly incurs cost to evaluate function
   // arguments even when tracing is disabled.
-  gl->PushGroupMarkerEXT(0, "GpuRasterization");
+  gl->TraceBeginCHROMIUM("ScopedGpuRaster", "GpuRasterization");
 
   class GrContext* gr_context = context_provider_->GrContext();
   gr_context->resetContext();
@@ -45,7 +45,7 @@ void ScopedGpuRaster::EndGpuRaster() {
   // TODO(alokp): Use a trace macro to push/pop markers.
   // Using push/pop functions directly incurs cost to evaluate function
   // arguments even when tracing is disabled.
-  gl->PopGroupMarkerEXT();
+  gl->TraceEndCHROMIUM();
 }
 
 }  // namespace cc