Add GPU memory usage contents browser test

content/common/gpu/gpu_memory_manager.cc

Index: content/common/gpu/gpu_memory_manager.cc
diff --git a/content/common/gpu/gpu_memory_manager.cc b/content/common/gpu/gpu_memory_manager.cc
index b8667d2ab13a96458435e05472b4549449231854..a6e145e0c228cd186ddc57ae77abd50099468a16 100644
--- a/content/common/gpu/gpu_memory_manager.cc
+++ b/content/common/gpu/gpu_memory_manager.cc
@@ -423,6 +423,10 @@ void GpuMemoryManager::GetVideoMemoryUsageStats(
       base::GetCurrentProcId()].video_memory = GetCurrentUsage();
   video_memory_usage_stats->process_map[

[nduca, 2013/01/05 05:14:42]

as an aside, any reason we say video memory  rather than gpu memory? it feels a
bit inconsistent

[ccameron, 2013/01/07 21:36:34]

The changes adding video_memory came about before I'd converged on a name. I
should do a re-naming change.

       base::GetCurrentProcId()].has_duplicates = true;
+
+  video_memory_usage_stats->bytes_allocated = GetCurrentUsage();
+  video_memory_usage_stats->bytes_allocated_historical_max =
+      bytes_allocated_historical_max_;
 }
 
 void GpuMemoryManager::SetWindowCount(uint32 window_count) {