Calling OpenGL from the renderer process.

gpu/command_buffer/service/gpu_processor_mac.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "gpu/command_buffer/service/gpu_processor.h"
 
 using ::base::SharedMemory;
 
 namespace gpu {
 
-bool GPUProcessor::Initialize(gfx::PluginWindowHandle handle) {
+bool GPUProcessor::Initialize(gfx::PluginWindowHandle handle,
+                              GPUProcessor* parent,
+                              const gfx::Size& size,
+                              uint32 parent_texture_id) {
   // At this level we do not need the PluginWindowHandle. It is only
   // needed at the CommandBufferStub level to identify which GPU
   // plugin instance is creating a new backing store in response to a
   // resize event.
 
   // Map the ring buffer and create the parser.
   Buffer ring_buffer = command_buffer_->GetRingBuffer();
   if (ring_buffer.ptr) {
     parser_.reset(new CommandParser(ring_buffer.ptr,
                                     ring_buffer.size,
                                     0,
                                     ring_buffer.size,
                                     0,
                                     decoder_.get()));
   } else {
     parser_.reset(new CommandParser(NULL, 0, 0, 0, 0,
                                     decoder_.get()));
   }
 
   // Initialize GAPI.
-  return decoder_->Initialize();
+  gles2::GLES2Decoder* parent_decoder = parent ? parent->decoder_.get() : NULL;
+  if (!decoder_->Initialize(parent_decoder,
+                            size,
+                            parent_texture_id)) {
+    Destroy();
+    return false;
+  }
+
+  return true;
 }
 
 void GPUProcessor::Destroy() {
-  decoder_->Destroy();
+  // Destroy decoder if initialized.
+  if (decoder_.get()) {
+    decoder_->Destroy();
+    decoder_.reset();
+  }
+
+  parser_.reset();
 }
 }  // namespace gpu