Add GPU memory tab to the task manager.

content/common/gpu/gpu_messages.h

Index: content/common/gpu/gpu_messages.h
diff --git a/content/common/gpu/gpu_messages.h b/content/common/gpu/gpu_messages.h
index 2415fa8661e3c31b2b7345b16c2643727e948519..3e96bb7dd0b67399df31cbcb422a23ea02e903c5 100644
--- a/content/common/gpu/gpu_messages.h
+++ b/content/common/gpu/gpu_messages.h
@@ -14,6 +14,7 @@
 #include "content/common/gpu/gpu_process_launch_causes.h"
 #include "content/public/common/common_param_traits.h"
 #include "content/public/common/gpu_info.h"
+#include "content/public/common/gpu_memory_stats.h"
 #include "gpu/command_buffer/common/command_buffer.h"
 #include "gpu/command_buffer/common/constants.h"
 #include "gpu/ipc/gpu_command_buffer_traits.h"
@@ -162,6 +163,15 @@ IPC_STRUCT_TRAITS_BEGIN(content::GPUInfo)
 #endif
 IPC_STRUCT_TRAITS_END()
 
+IPC_STRUCT_TRAITS_BEGIN(content::GPUVideoMemoryUsageStats::ProcessStats)
+  IPC_STRUCT_TRAITS_MEMBER(video_memory)
+  IPC_STRUCT_TRAITS_MEMBER(has_duplicates)
+IPC_STRUCT_TRAITS_END()
+
+IPC_STRUCT_TRAITS_BEGIN(content::GPUVideoMemoryUsageStats)
+  IPC_STRUCT_TRAITS_MEMBER(process_map)
+IPC_STRUCT_TRAITS_END()
+
 IPC_STRUCT_TRAITS_BEGIN(GpuMemoryAllocationForRenderer)
   IPC_STRUCT_TRAITS_MEMBER(gpu_resource_size_in_bytes)
   IPC_STRUCT_TRAITS_MEMBER(suggest_have_backbuffer)
@@ -221,6 +231,9 @@ IPC_MESSAGE_CONTROL4(GpuMsg_CreateViewCommandBuffer,
 // information.
 IPC_MESSAGE_CONTROL0(GpuMsg_CollectGraphicsInfo)
 
+// Tells the GPU process to report video_memory information for the task manager
+IPC_MESSAGE_CONTROL0(GpuMsg_GetVideoMemoryUsageStats)
+
 // Tells the GPU process that the browser process has finished resizing the
 // view.
 IPC_MESSAGE_ROUTED0(AcceleratedSurfaceMsg_ResizeViewACK)
@@ -282,6 +295,10 @@ IPC_MESSAGE_CONTROL1(GpuHostMsg_DestroyCommandBuffer,
 IPC_MESSAGE_CONTROL1(GpuHostMsg_GraphicsInfoCollected,
                      content::GPUInfo /* GPU logging stats */)
 
+// Response from GPU to a GpuMsg_GetVideoMemory.
+IPC_MESSAGE_CONTROL1(GpuHostMsg_VideoMemoryUsageStats,
+                     content::GPUVideoMemoryUsageStats /* GPU memory stats */)
+
 // Message from GPU to add a GPU log message to the about:gpu page.
 IPC_MESSAGE_CONTROL3(GpuHostMsg_OnLogMessage,
                      int /*severity*/,