Expose GpuMemoryBufferId through glGetImageivCHROMIUM.

cc/test/test_gles2_interface.cc

Index: cc/test/test_gles2_interface.cc
diff --git a/cc/test/test_gles2_interface.cc b/cc/test/test_gles2_interface.cc
index 24d019d7d5d8d215bc300b4e4313fd21b0a8ea3b..cf8356692f3a8d8f37c96d799d6270bbc16baf76 100644
--- a/cc/test/test_gles2_interface.cc
+++ b/cc/test/test_gles2_interface.cc
@@ -299,6 +299,10 @@ GLuint TestGLES2Interface::CreateGpuMemoryBufferImageCHROMIUM(
       width, height, internalformat, usage);
 }
 
+GLint TestGLES2Interface::GetImageivCHROMIUM(GLuint image_id, GLenum param) {
+  return test_context_->getImageivCHROMIUM(image_id, param);
+}
+
 void TestGLES2Interface::BindTexImage2DCHROMIUM(GLenum target, GLint image_id) {
   test_context_->bindTexImage2DCHROMIUM(target, image_id);
 }