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..323aa0c62cb5beec81cd5e7bb0a488edea62146e 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_VideoMemoryUsageStats,
+                        OnVideoMemoryUsageStatsReceived);
 #if defined(TOOLKIT_GTK) || defined(OS_WIN)
     IPC_MESSAGE_HANDLER(GpuHostMsg_ResizeView, OnResizeView)
 #endif
@@ -367,3 +368,10 @@ void GpuProcessHostUIShim::OnAcceleratedSurfaceRelease(
     return;
   view->AcceleratedSurfaceRelease(params.identifier);
 }
+
+void GpuProcessHostUIShim::OnVideoMemoryUsageStatsReceived(
+    const content::GPUVideoMemoryUsageStats& video_memory_usage_stats) {
+  GpuDataManagerImpl::GetInstance()->UpdateVideoMemoryUsageStats(
+      video_memory_usage_stats);
+}
+