add components for integration test which will detect breakage of media pipeline with video captu...

webkit/support/test_media_stream_client.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 "webkit/support/test_media_stream_client.h"
+
+#include "googleurl/src/gurl.h"
+#include "media/base/message_loop_factory.h"
+#include "media/base/pipeline.h"
+#include "media/filters/video_frame_generator.h"
+
+namespace {
+
+static const int kVideoCaptureWidth = 352;
+static const int kVideoCaptureHeight = 288;
+static const int kVideoCaptureFrameDurationMs = 33;
+
+}  // namespace
+
+namespace webkit_support {
+
+TestMediaStreamClient::TestMediaStreamClient(MediaStreamUtil* media_stream_util)
+    : media_stream_util_(media_stream_util) {
+}
+
+scoped_refptr<media::VideoDecoder> TestMediaStreamClient::GetVideoDecoder(
+    const GURL& url, media::MessageLoopFactory* message_loop_factory) {
+  if (!media_stream_util_)
+    return NULL;
+
+  bool raw_media = media_stream_util_->IsMockStream(url);
+  media::VideoDecoder* decoder = NULL;
+  if (raw_media) {

[acolwell GONE FROM CHROMIUM, 2012/01/06 18:09:16]

nit: Reversing the condition and returning early will allow you to reduce the
indent level of this code. You also don't need the local variable.

[wjia(left Chromium), 2012/01/06 22:18:59]

Done.

+    gfx::Size size(kVideoCaptureWidth, kVideoCaptureHeight);
+    base::TimeDelta frame_duration =
+        base::TimeDelta::FromMilliseconds(kVideoCaptureFrameDurationMs);
+
+    decoder = new media::VideoFrameGenerator(
+        message_loop_factory->GetMessageLoopProxy("CaptureVideoDecoder").get(),
+        size, frame_duration);
+  }
+  return decoder;
+}
+
+}  // namespace webkit_support