Plumb GpuMemoryBuffer allocation to GPU process.

ui/gfx/gpu_memory_buffer.h

Index: ui/gfx/gpu_memory_buffer.h
diff --git a/ui/gfx/gpu_memory_buffer.h b/ui/gfx/gpu_memory_buffer.h
index d09dd1092f1e6325545289918ee51644fda33e57..ec192c1765ef66a4acec07cc428c7039046acb98 100644
--- a/ui/gfx/gpu_memory_buffer.h
+++ b/ui/gfx/gpu_memory_buffer.h
@@ -24,6 +24,8 @@ enum GpuMemoryBufferType {
   GPU_MEMORY_BUFFER_TYPE_LAST = SURFACE_TEXTURE_BUFFER
 };
 
+// TODO(alexst): Merge this with GpuMemoryBufferId as part of switchover to
+// the new API for GpuMemoryBuffer allocation when it's done.
 #if defined(OS_ANDROID)
 struct SurfaceTextureId {
   SurfaceTextureId() : primary_id(0), secondary_id(0) {}
@@ -34,6 +36,14 @@ struct SurfaceTextureId {
 };
 #endif
 
+struct GpuMemoryBufferId {
+  GpuMemoryBufferId() : primary_id(0), secondary_id(0) {}
+  GpuMemoryBufferId(int32 primary_id, int32 secondary_id)
+      : primary_id(primary_id), secondary_id(secondary_id) {}
+  int32 primary_id;
+  int32 secondary_id;
+};
+
 struct GpuMemoryBufferHandle {
   GpuMemoryBufferHandle()
       : type(EMPTY_BUFFER),
@@ -51,6 +61,7 @@ struct GpuMemoryBufferHandle {
   bool is_null() const { return type == EMPTY_BUFFER; }
   GpuMemoryBufferType type;
   base::SharedMemoryHandle handle;
+  GpuMemoryBufferId global_id;
 #if defined(OS_MACOSX)
   uint32 io_surface_id;
 #endif