Re-enable GPU partial raster for non-MSAA content

cc/trees/layer_tree_host_pixeltest_tiles.cc

 // Copyright 2015 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 <stddef.h>
 
 #include "cc/layers/content_layer_client.h"
 #include "cc/layers/picture_layer.h"
 #include "cc/output/copy_output_request.h"
 #include "cc/playback/display_item_list.h"
@@ skipping 205 matching lines @@
       base::FilePath(FILE_PATH_LITERAL("blue_yellow_partial_flipped.png")));
 }
 
 TEST_F(LayerTreeHostTilesTestPartialInvalidation,
        FulllRaster_SingleThread_Software) {
   RunRasterPixelTest(
       false, FULL_BITMAP, picture_layer_,
       base::FilePath(FILE_PATH_LITERAL("blue_yellow_flipped.png")));
 }
 
-// TODO(crbug.com/629683): Re-enable this test once GPU partial raster issues
-// are fixed.
 TEST_F(LayerTreeHostTilesTestPartialInvalidation,
-       DISABLED_PartialRaster_SingleThread_GpuRaster) {
+       PartialRaster_SingleThread_GpuRaster) {
   RunRasterPixelTest(
       false, PARTIAL_GPU, picture_layer_,
       base::FilePath(FILE_PATH_LITERAL("blue_yellow_partial_flipped.png")));
 }
 
 TEST_F(LayerTreeHostTilesTestPartialInvalidation,
        FullRaster_SingleThread_GpuRaster) {
   RunRasterPixelTest(
       false, FULL_GPU, picture_layer_,
       base::FilePath(FILE_PATH_LITERAL("blue_yellow_flipped.png")));
 }
 
 }  // namespace
 }  // namespace cc
 
 #endif  // !defined(OS_ANDROID)