Fixing transparent pixels appearing black when rendered for the context menu.

chrome/browser/renderer_context_menu/render_view_context_menu_browsertest.cc

 // Copyright 2014 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 "chrome/browser/renderer_context_menu/render_view_context_menu.h"
 
 #include <algorithm>
 #include <memory>
 #include <string>
 #include <utility>
@@ skipping 722 matching lines @@
   auto callback = [](bool* response_received, const base::Closure& quit,
                      const std::vector<uint8_t>& thumbnail_data,
                      const gfx::Size& original_size) {
     *response_received = true;
     quit.Run();
   };
 
   base::RunLoop run_loop;
   bool response_received = false;
   thumbnail_capturer->RequestThumbnailForContextNode(
-      0, gfx::Size(2048, 2048),
+      0, gfx::Size(2048, 2048), true,
       base::Bind(callback, &response_received, run_loop.QuitClosure()));
   run_loop.Run();
 
   // The browser should receive a response from the renderer, because the
   // renderer should not crash.
   ASSERT_TRUE(response_received);
 }
 
 IN_PROC_BROWSER_TEST_F(PdfPluginContextMenuBrowserTest,
                        FullPagePdfHasPageItems) {
@@ skipping 153 matching lines @@
 IN_PROC_BROWSER_TEST_F(LoadImageBrowserTest, LoadImage) {
   static const char kValidImage[] = "/load_image/image.png";
   SetupAndLoadImagePage(kValidImage);
   AddLoadImageInterceptor(kValidImage);
   AttemptLoadImage();
   interceptor_->WaitForRequests(1);
   EXPECT_EQ(1, interceptor_->num_requests());
 }
 
 }  // namespace