Be explicit about namespace testing to not mix it with blink::testing

third_party/WebKit/Source/platform/graphics/paint/DrawingDisplayItemTest.cpp

 // Copyright 2017 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 "platform/graphics/paint/DrawingDisplayItem.h"
 
 #include "SkTypes.h"
 #include "platform/graphics/paint/PaintRecorder.h"
 #include "platform/graphics/skia/SkiaUtils.h"
 #include "platform/testing/FakeDisplayItemClient.h"
 #include "public/platform/WebDisplayItemList.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace blink {
 namespace {
 
-using testing::_;
+using ::testing::_;
 
 class DrawingDisplayItemTest : public ::testing::Test {
  protected:
   FakeDisplayItemClient client_;
 };
 
 class MockWebDisplayItemList : public WebDisplayItemList {
  public:
   MOCK_METHOD3(AppendDrawingItem,
                void(const WebRect& visual_rect,
@@ skipping 31 matching lines @@
   WebRect expected_visual_rect = EnclosingIntRect(visual_rect_with_offset);
   MockWebDisplayItemList list2;
   EXPECT_CALL(list2,
               AppendDrawingItem(expected_visual_rect, _, expected_record_rect))
       .Times(1);
   item.AppendToWebDisplayItemList(offset, &list2);
 }
 
 }  // namespace
 }  // namespace blink