gpu: Add a new extension CHROMIUM_deschedule.

gpu/command_buffer/client/gles2_implementation_impl_autogen.h

Index: gpu/command_buffer/client/gles2_implementation_impl_autogen.h
diff --git a/gpu/command_buffer/client/gles2_implementation_impl_autogen.h b/gpu/command_buffer/client/gles2_implementation_impl_autogen.h
index c2c10b778f13d8d3092c04c41ef93eddf0c73569..37ac865b28705830bf2abe5d64cb3c9e2ab1fd4c 100644
--- a/gpu/command_buffer/client/gles2_implementation_impl_autogen.h
+++ b/gpu/command_buffer/client/gles2_implementation_impl_autogen.h
@@ -3075,6 +3075,14 @@ void GLES2Implementation::BindVertexArrayOES(GLuint array) {
   CheckGLError();
 }
 
+void GLES2Implementation::DescheduleUntilFinishedCHROMIUM() {
+  GPU_CLIENT_SINGLE_THREAD_CHECK();
+  GPU_CLIENT_LOG("[" << GetLogPrefix() << "] glDescheduleUntilFinishedCHROMIUM("
+                     << ")");
+  helper_->DescheduleUntilFinishedCHROMIUM();
+  CheckGLError();
+}
+
 void GLES2Implementation::GetTranslatedShaderSourceANGLE(GLuint shader,
                                                          GLsizei bufsize,
                                                          GLsizei* length,