Fix timestamp sent from CanvasCaptureHandler & make thread checkers clear

content/renderer/media/canvas_capture_handler_unittest.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 "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/thread_task_runner_handle.h"
 #include "content/child/child_process.h"
 #include "content/renderer/media/canvas_capture_handler.h"
 #include "content/renderer/media/media_stream_video_capturer_source.h"
@@ skipping 82 matching lines @@
 
   void OnVerifyDeliveredFrame(
       bool opaque,
       const scoped_refptr<media::VideoFrame>& video_frame,
       base::TimeTicks estimated_capture_time) {
     if (opaque)
       EXPECT_EQ(media::PIXEL_FORMAT_I420, video_frame->format());
     else
       EXPECT_EQ(media::PIXEL_FORMAT_YV12A, video_frame->format());
 
+    EXPECT_EQ(video_frame->timestamp().InMilliseconds(),

[Lei Zhang, 2016/03/10 21:44:02]

This has been failing on memory.fyi bots, e.g.

https://build.chromium.org/p/chromium.memory.fyi/builders/Chromium%20OS%20%28...

+              (estimated_capture_time - base::TimeTicks()).InMilliseconds());
     const gfx::Size& size = video_frame->coded_size();
     EXPECT_EQ(kTestCanvasCaptureFrameWidth, size.width());
     EXPECT_EQ(kTestCanvasCaptureFrameHeight, size.height());
     const uint8_t* y_plane = video_frame->data(media::VideoFrame::kYPlane);
     EXPECT_NEAR(74, y_plane[0], kTestCanvasCaptureFrameErrorTolerance);
     const uint8_t* u_plane = video_frame->data(media::VideoFrame::kUPlane);
     EXPECT_NEAR(193, u_plane[0], kTestCanvasCaptureFrameErrorTolerance);
     const uint8_t* v_plane = video_frame->data(media::VideoFrame::kVPlane);
     EXPECT_NEAR(105, v_plane[0], kTestCanvasCaptureFrameErrorTolerance);
     if (!opaque) {
@@ skipping 99 matching lines @@
           track_.source().getExtraData()));
   EXPECT_TRUE(source != nullptr);
   EXPECT_TRUE(canvas_capture_handler_->needsNewFrame());
   source->StopCapture();
   EXPECT_FALSE(canvas_capture_handler_->needsNewFrame());
 }
 
 INSTANTIATE_TEST_CASE_P(, CanvasCaptureHandlerTest, ::testing::Bool());
 
 }  // namespace content