Expose mapExternalTexture extension to WebGraphicsContext3D

webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.cc

 // Copyright (c) 2011 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.
 
 #if defined(ENABLE_GPU)
 
 #include "webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.h"
 
 #include <GLES2/gl2.h>
 #ifndef GL_GLEXT_PROTOTYPES
@@ skipping 949 matching lines @@
   gl_->UnmapTexSubImage2DCHROMIUM(mem);
 }
 
 void WebGraphicsContext3DInProcessCommandBufferImpl::
     copyTextureToParentTextureCHROMIUM(WebGLId texture, WebGLId parentTexture) {
   // TODO(gmam): See if we can comment this in.
   // ClearContext();
   copyTextureToCompositor(texture, parentTexture);
 }
 
+void WebGraphicsContext3DInProcessCommandBufferImpl::mapExternalTextureCHROMIUM(
+      WebGLId source_texture, WebGraphicsContext3D* source_context,
+      WebGLId destination_texture) {
+  WebGraphicsContext3DInProcessCommandBufferImpl* source_cmdbuffer_context =
+      static_cast<WebGraphicsContext3DInProcessCommandBufferImpl*>(
+          source_context);
+  context_->MapExternalResource(::gpu::resource_type::kTexture,
+                                source_texture,
+                                source_cmdbuffer_context->context(),
+                                destination_texture);
+}
+
 void WebGraphicsContext3DInProcessCommandBufferImpl::
     rateLimitOffscreenContextCHROMIUM() {
   // TODO(gmam): See if we can comment this in.
   // ClearContext();
   gl_->RateLimitOffscreenContextCHROMIUM();
 }
 
 WebKit::WebString WebGraphicsContext3DInProcessCommandBufferImpl::
     getRequestableExtensionsCHROMIUM() {
   // TODO(gmam): See if we can comment this in.
@@ skipping 703 matching lines @@
   if (context_lost_callback_) {
     context_lost_callback_->onContextLost();
   }
 }
 
 }  // namespace gpu
 }  // namespace webkit
 
 #endif  // defined(ENABLE_GPU)