Handle Alpha channel in Canvas capture

media/base/mac/video_frame_mac_unittests.cc

 // Copyright (c) 2012 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 "media/base/mac/video_frame_mac.h"
 
 #include <stddef.h>
 
 #include <utility>
 
@@ skipping 76 matching lines @@
 }
 
 TEST(VideoFrameMac, CheckLifetime) {
   gfx::Size size(kWidth, kHeight);
   auto frame = VideoFrame::CreateFrame(PIXEL_FORMAT_I420, size, gfx::Rect(size),
                                        size, kTimestamp);
   ASSERT_TRUE(frame.get());
 
   int instances_destroyed = 0;
   auto wrapper_frame = VideoFrame::WrapVideoFrame(
-      frame, frame->visible_rect(), frame->natural_size());
+      frame, frame->format(), frame->visible_rect(), frame->natural_size());
   wrapper_frame->AddDestructionObserver(
       base::Bind(&Increment, &instances_destroyed));
   ASSERT_TRUE(wrapper_frame.get());
 
   auto pb = WrapVideoFrameInCVPixelBuffer(*wrapper_frame);
   ASSERT_TRUE(pb.get());
 
   wrapper_frame = nullptr;
   EXPECT_EQ(0, instances_destroyed);
   pb.reset();
@@ skipping 18 matching lines @@
     ASSERT_TRUE(frame.get());
     EXPECT_EQ(pb.get(), frame->cv_pixel_buffer());
     EXPECT_EQ(format_pair.chrome, frame->format());
 
     frame = nullptr;
     EXPECT_EQ(1, CFGetRetainCount(pb.get()));
   }
 }
 
 }  // namespace media