Migrate WebRtcVideoQualityBrowserTest to using FileVideoCaptureDevice.

The WebRtcVideoQualityBrowserTest has only one test 
case currently, that test encode-decoding of a stream,
then dumps a series of png files from which it recovers
a yuv sequence that is then compared to the original.

This CL changes the infrastructure of the test, from an 
external fake webcam, to using the FileVideoCaptureDevice.
This device uses an .y4m file, that is expected to be 
in the same location as the .yuv reference file, and both
should be the same sequence. This location is hanging at
the same place and level than Chromium src checkout, and
with a name "webrtc_videos"

This folder is not the same used by the test as 
scratch.

Using WebRtcVideoQualityBrowserTest::GetSourceDir()/../bla
was not possible because the base::File used inside FileVCD
does not tolerate relative paths. So a peculiar method
GetReferencesVideosDir() is introduced, were the trailing
.../src is removed manually from the path.

BUG=343504, 340609

Review URL: https://codereview.chromium.org/192293005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@257374 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 13 insertions, 2 deletions

diff --git a/chrome/browser/media/webrtc_browsertest_base.cc b/chrome/browser/media/webrtc_browsertest_base.cc
index 5ec4623..21c18b5 100644
--- a/chrome/browser/media/webrtc_browsertest_base.cc
+++ b/chrome/browser/media/webrtc_browsertest_base.cc
@@ -21,6 +21,9 @@
 
 const char WebRtcTestBase::kAudioVideoCallConstraints[] =
     "'{audio: true, video: true}'";
+const char WebRtcTestBase::kAudioVideoCallConstraints360p[] =
+   "'{audio: true, video: {mandatory: {minWidth: 640, maxWidth: 640, "
+   " minHeight: 360, maxHeight: 360}}}'";
 const char WebRtcTestBase::kAudioOnlyCallConstraints[] = "'{audio: true}'";
 const char WebRtcTestBase::kVideoOnlyCallConstraints[] = "'{video: true}'";
 const char WebRtcTestBase::kFailedWithPermissionDeniedError[] =
@@ -149,7 +152,15 @@ InfoBar* WebRtcTestBase::GetUserMediaAndWaitForInfoBar(
 }
 
 content::WebContents* WebRtcTestBase::OpenPageAndGetUserMediaInNewTab(
-      const GURL& url) const {
+    const GURL& url) const {
+  return OpenPageAndGetUserMediaInNewTabWithConstraints(
+      url, kAudioVideoCallConstraints);
+}
+
+content::WebContents*
+WebRtcTestBase::OpenPageAndGetUserMediaInNewTabWithConstraints(
+    const GURL& url,
+    const std::string& constraints) const {
   chrome::AddTabAt(browser(), GURL(), -1, true);
   ui_test_utils::NavigateToURL(browser(), url);
 #if defined (OS_LINUX)
@@ -158,7 +169,7 @@ content::WebContents* WebRtcTestBase::OpenPageAndGetUserMediaInNewTab(
 #endif
   content::WebContents* new_tab =
       browser()->tab_strip_model()->GetActiveWebContents();
-  GetUserMediaAndAccept(new_tab);
+  GetUserMediaWithSpecificConstraintsAndAccept(new_tab, constraints);
   return new_tab;
 }