Moved creation of GPU command buffer shared memory into the browser process....

gpu/command_buffer/common/command_buffer.h

Index: gpu/command_buffer/common/command_buffer.h
===================================================================
--- gpu/command_buffer/common/command_buffer.h	(revision 76263)
+++ gpu/command_buffer/common/command_buffer.h	(working copy)
@@ -8,6 +8,10 @@
 #include "../common/buffer.h"
 #include "../common/constants.h"
 
+namespace base {
+class SharedMemory;
+}
+
 namespace gpu {
 
 // Common interface for CommandBuffer implementations.
@@ -55,6 +59,9 @@
   // Initialize the command buffer with the given size.
   virtual bool Initialize(int32 size) = 0;
 
+  // Initialize the command buffer using the given preallocated buffer.
+  virtual bool Initialize(base::SharedMemory* buffer, int32 size) = 0;
+
   // Gets the ring buffer for the command buffer.
   virtual Buffer GetRingBuffer() = 0;