Add CommandBuffer::SetGetBuffer

gpu/command_buffer/service/cmd_parser.h

Index: gpu/command_buffer/service/cmd_parser.h
diff --git a/gpu/command_buffer/service/cmd_parser.h b/gpu/command_buffer/service/cmd_parser.h
index fe3eb12dc6836fa9aebfb81115f1fc9783f49e5d..567b7f611a06cf044abd15d71d170cac207c830c 100644
--- a/gpu/command_buffer/service/cmd_parser.h
+++ b/gpu/command_buffer/service/cmd_parser.h
@@ -18,12 +18,14 @@ class AsyncAPIInterface;
 // buffer, to implement some asynchronous RPC mechanism.
 class CommandParser {
  public:
-  CommandParser(void *shm_address,
-                size_t shm_size,
-                ptrdiff_t offset,
-                size_t size,
-                CommandBufferOffset start_get,
-                AsyncAPIInterface *handler);
+  explicit CommandParser(AsyncAPIInterface* handler);
+
+  // Sets the buffer to read commands from.
+  void SetBuffer(
+      void* shm_address,
+      size_t shm_size,
+      ptrdiff_t offset,
+      size_t size);
 
   // Gets the "get" pointer. The get pointer is an index into the command
   // buffer considered as an array of CommandBufferEntry.
@@ -63,9 +65,9 @@ class CommandParser {
  private:
   CommandBufferOffset get_;
   CommandBufferOffset put_;
-  CommandBufferEntry *buffer_;
+  CommandBufferEntry* buffer_;
   int32 entry_count_;
-  AsyncAPIInterface *handler_;
+  AsyncAPIInterface* handler_;
 };
 
 // This class defines the interface for an asynchronous API handler, that