Add GPU memory tab to the task manager.

content/browser/gpu/gpu_process_host_ui_shim.cc

Index: content/browser/gpu/gpu_process_host_ui_shim.cc
diff --git a/content/browser/gpu/gpu_process_host_ui_shim.cc b/content/browser/gpu/gpu_process_host_ui_shim.cc
index beee4f3e84e2d6532e7eebf2ace143dc711722bb..eab3f9318424b45b3546a3d136b764cc85aa2ec5 100644
--- a/content/browser/gpu/gpu_process_host_ui_shim.cc
+++ b/content/browser/gpu/gpu_process_host_ui_shim.cc
@@ -207,7 +207,8 @@ bool GpuProcessHostUIShim::OnControlMessageReceived(
                         OnAcceleratedSurfaceNew)
     IPC_MESSAGE_HANDLER(GpuHostMsg_AcceleratedSurfaceRelease,
                         OnAcceleratedSurfaceRelease)
-
+    IPC_MESSAGE_HANDLER(GpuHostMsg_Vidmem,

[greggman, 2012/08/14 23:48:17]

Sorry to bring this up again but "OnVidmem" has no meaning to me. Looking at
other 7 messages above, every one of them is self explanatory.

OnLogMessage 
OnAcceleratedSurfaceBuffersSwapped
OnAcceleratedSurfacePostSubBuffer
OnAcceleratedSurfaceSuspend
OnGraphicsInfoCollected
OnAcceleratedSurfaceNew
OnAcceleratedSurfaceRelease

But what is OnVidMem?
OnVideoMemoryAllocated? OnVideoMemoryAllocationChanged?

[ccameron, 2012/08/15 02:20:41]

Yes, this was a poor name.  I change the vague "Vidmem" to "VidmemUsageStats"
which is more self-explanatory.

+                        OnVidmem);
 #if defined(TOOLKIT_GTK) || defined(OS_WIN)
     IPC_MESSAGE_HANDLER(GpuHostMsg_ResizeView, OnResizeView)
 #endif
@@ -367,3 +368,8 @@ void GpuProcessHostUIShim::OnAcceleratedSurfaceRelease(
     return;
   view->AcceleratedSurfaceRelease(params.identifier);
 }
+
+void GpuProcessHostUIShim::OnVidmem(const content::GPUVidmem& vidmem) {
+  GpuDataManagerImpl::GetInstance()->UpdateVidmem(vidmem);
+}
+