Expose mapExternalTexture extension to WebGraphicsContext3D

webkit/gpu/webgraphicscontext3d_in_process_impl.cc

Index: webkit/gpu/webgraphicscontext3d_in_process_impl.cc
diff --git a/webkit/gpu/webgraphicscontext3d_in_process_impl.cc b/webkit/gpu/webgraphicscontext3d_in_process_impl.cc
index 6b8d7fc03217ebea1fad7b3a38ec35e24a5f68d3..ea1f578a8688440881d480bb0c0bff681e429125 100644
--- a/webkit/gpu/webgraphicscontext3d_in_process_impl.cc
+++ b/webkit/gpu/webgraphicscontext3d_in_process_impl.cc
@@ -694,6 +694,12 @@ void WebGraphicsContext3DInProcessImpl::copyTextureToParentTextureCHROMIUM(
   glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, bound_fbo_);
 }
 
+void WebGraphicsContext3DInProcessImpl::mapExternalTextureCHROMIUM(
+      WebGLId source_texture, WebGraphicsContext3D* source_context,
+      WebGLId destination_texture) {
+  // TODO(jamesr): implement this, if this is a supported configuration.
+}
+
 WebString WebGraphicsContext3DInProcessImpl::
     getRequestableExtensionsCHROMIUM() {
   return WebString();