Add browser tests for canPlayType() results

content/browser/media/media_canplaytype_browsertest.cc

Index: content/browser/media/media_canplaytype_browsertest.cc
diff --git a/content/browser/media/media_canplaytype_browsertest.cc b/content/browser/media/media_canplaytype_browsertest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..2a0d001d5003a437fa4d09a8442c773049945e9b
--- /dev/null
+++ b/content/browser/media/media_canplaytype_browsertest.cc
@@ -0,0 +1,245 @@
+// Copyright (c) 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 <string>
+
+#include "content/browser/media/media_browsertest.h"
+#include "content/public/test/browser_test_utils.h"
+#include "content/shell/browser/shell.h"
+#include "content/test/content_browser_test_utils.h"
+
+const char* kProbably = "probably";
+const char* kMaybe = "maybe";
+const char* kNot = "";
+
+#if defined(USE_PROPRIETARY_CODECS)
+const char* kPropProbably = "probably";
+const char* kPropMaybe = "maybe";
+const char* kPropProbablyElseMaybe = "probably";
+#else
+const char* kPropProbably = "";
+const char* kPropMaybe = "";
+const char* kPropProbablyElseMaybe = "maybe";
+#endif  // USE_PROPRIETARY_CODECS
+
+// TODO(amogh.bihani): Change the opus tests when opus is  on
+// Android. (http://crbug.com/318436).
+#if !defined(OS_ANDROID)
+const char* kTheoraProbably = "probably";
+const char* kTheoraMaybe = "maybe";
+const char* kOpusProbably = "probably";
+#if defined(USE_PROPRIETARY_CODECS)
+const char* kTheoraAndPropProbably = "probably";
+const char* kTheoraAndPropProbablyElseMaybe = "probably";
+const char* kOpusAndPropProbably = "probably";
+#else
+const char* kTheoraAndPropProbably = "";
+const char* kTheoraAndPropProbablyElseMaybe = "maybe";
+const char* kOpusAndPropProbably = "";
+#endif  // USE_PROPRIETARY_CODECS
+#else
+const char* kTheoraProbably = "";
+const char* kTheoraMaybe = "";
+const char* kOpusProbably = "";
+const char* kTheoraAndPropProbably = "";
+const char* kTheoraAndPropProbablyElseMaybe = "";
+const char* kOpusAndPropProbably = "";
+#endif  // !OS_ANDROID
+
+namespace content {
+
+class MediaMimeCanPlayType : public MediaBrowserTest {

[ddorwin, 2014/03/20 18:04:50]

nit: Drop "Mime" and add "Test":
MediaCanPlayTypeTest

[amogh.bihani, 2014/03/21 13:52:03]

Done.

+protected:
+  MediaMimeCanPlayType() { }

[ddorwin, 2014/03/20 18:04:50]

It's odd that these are protected. They appear to be public in the base classes.
But, you can just remove them since they are empty.

[amogh.bihani, 2014/03/21 13:52:03]

It does not allow to remove the constructor. It gives error that there is no
matching function to call MediaCanPlayTypeTest(). Perhaps testing::Test uses the
constructor to call the tests.[1]

Now, I also initialize url in the constructor itself so this would be needed.
------------
[1]
https://code.google.com/p/chromium/codesearch#chromium/src/testing/gtest/src/...

+  ~MediaMimeCanPlayType() { }

[ddorwin, 2014/03/20 18:04:50]

This should have been virtual, but just remove it.

[amogh.bihani, 2014/03/21 13:52:03]

Done.

+
+  std::string CanPlay(const std::string& type) {
+    std::string command("document.createElement('video').canPlayType(");
+    command.append(type);
+    command.append(")");
+
+    std::string result;
+    EXPECT_TRUE(ExecuteScriptAndExtractString(
+        shell()->web_contents(),
+        "window.domAutomationController.send(" + command + ");",
+        &result));
+    return result;
+  }
+
+  void SetUpOnMainThread() {

[ddorwin, 2014/03/20 18:04:50]

Add virtual and OVERRIDE:
virtual void SetUpOnMainThread() OVERRIDE {

[amogh.bihani, 2014/03/21 13:52:03]

Done.

+    GURL url("about:blank");

[ddorwin, 2014/03/20 18:04:50]

nit: I think it's better to have this function up with the constructors. Also,
this is public in the base class, so we should make it public.

[amogh.bihani, 2014/03/21 13:52:03]

Done.

+    NavigateToURL(shell(), url);
+  }
+
+private:
+  DISALLOW_COPY_AND_ASSIGN(MediaMimeCanPlayType);
+};
+

[ddorwin, 2014/03/20 18:04:50]

General: We might test that we ignore "profiles" (it's like codecs) [1] and any
other unrecognized parameter.

This might be duplicative with Blink's Layout Tests, but in theory, "profiles"
could apply differently to different types. Maybe we'll just leave that out
unless/until someone adds support for it.

[1] https://tools.ietf.org/html/rfc6381

+IN_PROC_BROWSER_TEST_F(MediaMimeCanPlayType, CodecSupportTest_wav) {
+  EXPECT_EQ(kMaybe, CanPlay("'audio/wav'"));
+  EXPECT_EQ(kProbably, CanPlay("'audio/wav; codecs=\"1\"'"));
+  EXPECT_EQ(kNot, CanPlay("'audio/wav; codecs=\"vorbis\"'"));
+  EXPECT_EQ(kNot, CanPlay("'audio/wav; codecs=\"theora\"'"));
+  EXPECT_EQ(kNot, CanPlay("'audio/wav; codecs=\"vp8\"'"));
+  EXPECT_EQ(kNot, CanPlay("'audio/wav; codecs=\"vp8.0\"'"));
+  EXPECT_EQ(kNot, CanPlay("'audio/wav; codecs=\"vp9\"'"));
+  EXPECT_EQ(kNot, CanPlay("'audio/wav; codecs=\"vp9.0\"'"));
+  EXPECT_EQ(kNot, CanPlay("'audio/wav; codecs=\"opus\"'"));
+  EXPECT_EQ(kNot, CanPlay("'audio/wav; codecs=\"avc3\"'"));
+  EXPECT_EQ(kNot, CanPlay("'audio/wav; codecs=\"mp4a.40.5\"'"));
+  EXPECT_EQ(kNot, CanPlay("'audio/wav; codecs=\"avc1.4D401E\"'"));
+  EXPECT_EQ(kNot, CanPlay("'audio/wav; codecs=\"garbage\"'"));

[ddorwin, 2014/03/20 18:04:50]

nit: I think we usually use "unknown", which is a bit clearer.

[amogh.bihani, 2014/03/21 13:52:03]

Done.

+}
+
+IN_PROC_BROWSER_TEST_F(MediaMimeCanPlayType, CodecSupportTest_webm) {
+  // video/webm
+  EXPECT_EQ(kMaybe, CanPlay("'video/webm'"));
+  EXPECT_EQ(kProbably, CanPlay("'video/webm; codecs=\"vp8\"'"));

[ddorwin, 2014/03/20 18:04:50]

nit: You can increase readability by adding an empty line where patterns repeat
or sections are completely different. For example, before this line...

+  EXPECT_EQ(kProbably, CanPlay("'video/webm; codecs=\"vp8.0\"'"));
+  EXPECT_EQ(kProbably, CanPlay("'video/webm; codecs=\"vp8, vorbis\"'"));
+  EXPECT_EQ(kProbably, CanPlay("'video/webm; codecs=\"vp8.0, vorbis\"'"));
+  EXPECT_EQ(kOpusProbably, CanPlay("'video/webm; codecs=\"vp8, opus\"'"));
+  EXPECT_EQ(kOpusProbably, CanPlay("'video/webm; codecs=\"vp8.0, opus\"'"));
+  EXPECT_EQ(kProbably, CanPlay("'video/webm; codecs=\"vp9\"'"));

[ddorwin, 2014/03/20 18:04:50]

Between vp8 and vp9, which are essentially the same...

+  EXPECT_EQ(kProbably, CanPlay("'video/webm; codecs=\"vp9.0\"'"));
+  EXPECT_EQ(kProbably, CanPlay("'video/webm; codecs=\"vp9, vorbis\"'"));
+  EXPECT_EQ(kProbably, CanPlay("'video/webm; codecs=\"vp9.0, vorbis\"'"));
+  EXPECT_EQ(kOpusProbably, CanPlay("'video/webm; codecs=\"vp9, opus\"'"));
+  EXPECT_EQ(kOpusProbably, CanPlay("'video/webm; codecs=\"vp9.0, opus\"'"));
+  EXPECT_EQ(kNot, CanPlay("'video/webm; codecs=\"vp9, 1\"'"));

[ddorwin, 2014/03/20 18:04:50]

And before this block of invalid items.

+  EXPECT_EQ(kNot, CanPlay("'video/webm; codecs=\"vp8.0, 1\"'"));
+  EXPECT_EQ(kNot, CanPlay("'video/webm; codecs=\"vp8, mp4a.40.2\"'"));
+  EXPECT_EQ(kNot, CanPlay("'video/webm; codecs=\"vp8.0, mp4a.40.2\"'"));
+  EXPECT_EQ(kNot, CanPlay("'video/webm; codecs=\"vp9, 1\"'"));
+  EXPECT_EQ(kNot, CanPlay("'video/webm; codecs=\"vp9.0, 1\"'"));
+  EXPECT_EQ(kNot, CanPlay("'video/webm; codecs=\"vp9, mp4a.40.2\"'"));
+  EXPECT_EQ(kNot, CanPlay("'video/webm; codecs=\"vp9.0, mp4a.40.2\"'"));
+  EXPECT_EQ(kNot, CanPlay("'video/webm; codecs=\"theora\"'"));
+  EXPECT_EQ(kNot, CanPlay("'video/webm; codecs=\"1\"'"));
+  EXPECT_EQ(kNot, CanPlay("'video/webm; codecs=\"avc1.4D401E\"'"));
+  EXPECT_EQ(kNot, CanPlay("'video/webm; codecs=\"mp4a.40.2\"'"));
+  EXPECT_EQ(kNot, CanPlay("'video/webm; codecs=\"garbage\"'"));
+  // audio/webm

[ddorwin, 2014/03/20 18:04:50]

nit: These comments are a bit redundant. (Normally we'd just change the test
name, but that will add test run time overhead.) I think it would be sufficient
to replace this with an empty line and remove the comments.
(Based on the comments for empty lines above, an empty line is less obvious, but
I think that might be okay.)

[amogh.bihani, 2014/03/21 13:52:03]

Done.

+  EXPECT_EQ(kMaybe, CanPlay("'audio/webm'"));
+  EXPECT_EQ(kProbably, CanPlay("'audio/webm; codecs=\"vorbis\"'"));

[ddorwin, 2014/03/20 18:04:50]

ditto

+  EXPECT_EQ(kOpusProbably, CanPlay("'audio/webm; codecs=\"opus\"'"));
+  EXPECT_EQ(kNot, CanPlay("'audio/webm; codecs=\"1\"'"));

[ddorwin, 2014/03/20 18:04:50]

ditto

+  EXPECT_EQ(kNot, CanPlay("'audio/webm; codecs=\"vp8\"'"));
+  EXPECT_EQ(kNot, CanPlay("'audio/webm; codecs=\"vp8.0\"'"));
+  EXPECT_EQ(kNot, CanPlay("'audio/webm; codecs=\"vp9\"'"));
+  EXPECT_EQ(kNot, CanPlay("'audio/webm; codecs=\"vp9.0\"'"));
+  EXPECT_EQ(kNot, CanPlay("'audio/webm; codecs=\"vp8, opus\"'"));
+  EXPECT_EQ(kNot, CanPlay("'audio/webm; codecs=\"vp8.0, opus\"'"));
+  EXPECT_EQ(kNot, CanPlay("'audio/webm; codecs=\"vp8, vorbis\"'"));
+  EXPECT_EQ(kNot, CanPlay("'audio/webm; codecs=\"vp8.0, vorbis\"'"));
+  EXPECT_EQ(kNot, CanPlay("'audio/webm; codecs=\"vp9, opus\"'"));
+  EXPECT_EQ(kNot, CanPlay("'audio/webm; codecs=\"vp9.0, opus\"'"));
+  EXPECT_EQ(kNot, CanPlay("'audio/webm; codecs=\"vp9, vorbis\"'"));
+  EXPECT_EQ(kNot, CanPlay("'audio/webm; codecs=\"vp9.0, vorbis\"'"));
+  EXPECT_EQ(kNot, CanPlay("'audio/webm; codecs=\"avc1.4D401E\"'"));
+  EXPECT_EQ(kNot, CanPlay("'audio/webm; codecs=\"mp4a.40.2\"'"));
+  EXPECT_EQ(kNot, CanPlay("'audio/webm; codecs=\"garbage\"'"));
+}
+
+IN_PROC_BROWSER_TEST_F(MediaMimeCanPlayType, CodecSupportTest_ogg) {
+  // video/ogg
+  EXPECT_EQ(kTheoraMaybe, CanPlay("'video/ogg'"));
+  EXPECT_EQ(kTheoraProbably, CanPlay("'video/ogg; codecs=\"theora\"'"));
+  EXPECT_EQ(kTheoraProbably, CanPlay("'video/ogg; codecs=\"theora, vorbis\"'"));
+  EXPECT_EQ(kTheoraProbably, CanPlay("'video/ogg; codecs=\"theora, opus\"'"));
+  EXPECT_EQ(kTheoraProbably, CanPlay("'video/ogg; codecs=\"vp8\"'"));
+  EXPECT_EQ(kTheoraAndPropProbablyElseMaybe,

[ddorwin, 2014/03/20 18:04:50]

Maybe a todo to fix this with a reference to your bug.

[amogh.bihani, 2014/03/21 13:52:03]

Done.

+            CanPlay("'video/ogg; codecs=\"avc1\"'"));
+  EXPECT_EQ(kTheoraAndPropProbablyElseMaybe,
+            CanPlay("'video/ogg; codecs=\"avc3\"'"));
+  EXPECT_EQ(kTheoraAndPropProbablyElseMaybe,
+            CanPlay("'video/ogg; codecs=\"mp4a\"'"));
+  EXPECT_EQ(kTheoraAndPropProbablyElseMaybe,
+            CanPlay("'video/ogg; codecs=\"avc1, mp4a\"'"));

[ddorwin, 2014/03/20 18:04:50]

You might add a test for avc1 and vorbis - one invalid and one valid codec for
Theora.

[amogh.bihani, 2014/03/21 13:52:03]

Done.

+  EXPECT_EQ(kTheoraMaybe, CanPlay("'video/ogg; codecs=\"avc1.4D401E\"'"));
+  EXPECT_EQ(kTheoraMaybe, CanPlay("'video/ogg; codecs=\"avc3.64001F\"'"));
+  EXPECT_EQ(kTheoraMaybe, CanPlay("'video/ogg; codecs=\"mp4a.4.02\"'"));
+  EXPECT_EQ(kTheoraMaybe,
+            CanPlay("'video/ogg; codecs=\"avc3.64001F, mp4a.40.2\"'"));
+  EXPECT_EQ(kTheoraMaybe, CanPlay("'video/ogg; codecs=\"garbage\"'"));
+  // audio/ogg
+  EXPECT_EQ(kMaybe, CanPlay("'audio/ogg'"));
+  EXPECT_EQ(kProbably, CanPlay("'audio/ogg; codecs=\"vorbis\"'"));
+  EXPECT_EQ(kTheoraProbably, CanPlay("'audio/ogg; codecs=\"theora\"'"));

[ddorwin, 2014/03/20 18:04:50]

We should not allow a video codec in "audio/*". If these pass, I think that's
another bug. Will your other CL fix this?
Please file a bug if necessary and add a TODO with the bug number here.

[amogh.bihani, 2014/03/21 06:27:08]

It will be fixed in other CL. In strict map there will be separate entries for
audio and video.
So afterwards these will behave like "webm". (See line 128 of this patchset)

+  EXPECT_EQ(kProbably, CanPlay("'audio/ogg; codecs=\"vp8\"'"));
+  EXPECT_EQ(kProbably, CanPlay("'audio/ogg; codecs=\"vp9\"'"));
+  EXPECT_EQ(kProbably, CanPlay("'audio/ogg; codecs=\"vp8.0\"'"));
+  EXPECT_EQ(kProbably, CanPlay("'audio/ogg; codecs=\"vp9.0\"'"));
+  EXPECT_EQ(kOpusProbably, CanPlay("'audio/ogg; codecs=\"opus\"'"));
+  EXPECT_EQ(kPropProbablyElseMaybe, CanPlay("'audio/ogg; codecs=\"mp4a\"'"));
+  EXPECT_EQ(kPropProbablyElseMaybe, CanPlay("'audio/ogg; codecs=\"avc1\"'"));

[ddorwin, 2014/03/20 18:04:50]

ditto about video codecs

[amogh.bihani, 2014/03/21 06:27:08]

ditto :)

+  EXPECT_EQ(kPropProbablyElseMaybe, CanPlay("'audio/ogg; codecs=\"avc3\"'"));
+  EXPECT_EQ(kMaybe, CanPlay("'audio/ogg; codecs=\"mp4a.40.2\"'"));

[ddorwin, 2014/03/20 18:04:50]

Just checking my understanding: These are maybe because we don't strip the
suffix because we don't expect a suffix with ogg, right?

[amogh.bihani, 2014/03/21 06:27:08]

Yes we do not expect suffix for ogg but right now we do not strip anywhere, even
for mp4. So renderer_webkitplatformsupport_impl takes the codec as a whole and
sends to mime_util. As there is no codec like mp4a.40.2 in "codecs_map_", it
gives a "maybe"[1]. Had it been only "mp4a" it would have given "probably"[2]
(Although both are wrong)
This will be fixed when ogg is strictly checked.

----------
[1]
https://code.google.com/p/chromium/codesearch#chromium/src/content/renderer/r...
[2]
https://code.google.com/p/chromium/codesearch#chromium/src/content/renderer/r...

+  EXPECT_EQ(kMaybe, CanPlay("'audio/ogg; codecs=\"avc1.4D401E\"'"));

[ddorwin, 2014/03/20 18:04:50]

ditto

+  EXPECT_EQ(kMaybe, CanPlay("'audio/ogg; codecs=\"avc3.64001F\"'"));
+  EXPECT_EQ(kMaybe, CanPlay("'audio/ogg; codecs=\"garbage\"'"));
+}
+
+IN_PROC_BROWSER_TEST_F(MediaMimeCanPlayType, CodecSupportTest_mpeg) {
+  EXPECT_EQ(kNot, CanPlay("'video/mp3'"));
+  // video/mp4
+  EXPECT_EQ(kPropMaybe, CanPlay("'video/mp4'"));
+  EXPECT_EQ(kPropProbably, CanPlay("'video/mp4; codecs=\"avc1\"'"));
+  EXPECT_EQ(kPropProbably, CanPlay("'video/mp4; codecs=\"avc3\"'"));
+  EXPECT_EQ(kPropProbably, CanPlay("'video/mp4; codecs=\"avc1, mp4a\"'"));
+  EXPECT_EQ(kPropProbably, CanPlay("'video/mp4; codecs=\"avc3\"'"));
+  EXPECT_EQ(kPropProbably, CanPlay("'video/mp4; codecs=\"avc1, mp4a\"'"));
+  EXPECT_EQ(kPropMaybe, CanPlay("'video/mp4; codecs=\"avc1.4D401E\"'"));

[ddorwin, 2014/03/20 18:04:50]

It seems backwards that we say probably for a less-specific value and maybe for
a specific value. Is that a bug?

[amogh.bihani, 2014/03/21 06:27:08]

yup

+  EXPECT_EQ(kPropMaybe, CanPlay("'video/mp4; codecs=\"avc3.64001F\"'"));
+  EXPECT_EQ(kPropMaybe,
+            CanPlay("'video/mp4; codecs=\"avc1.4D401E, mp4a.40.2\"'"));
+  EXPECT_EQ(kPropMaybe,
+            CanPlay("'video/mp4; codecs=\"avc3.64001F, mp4a.40.5\"'"));
+  EXPECT_EQ(kPropMaybe, CanPlay("'video/mp4; codecs=\"garbage\"'"));
+  EXPECT_EQ(kPropProbably, CanPlay("'video/mp4; codecs=\"vp8\"'"));
+  EXPECT_EQ(kOpusAndPropProbably, CanPlay("'video/mp4; codecs=\"opus\"'"));
+  EXPECT_EQ(kPropProbably, CanPlay("'video/mp4; codecs=\"vorbis\"'"));
+  EXPECT_EQ(kTheoraAndPropProbably, CanPlay("'video/mp4; codecs=\"theora\"'"));
+  EXPECT_EQ(kOpusAndPropProbably, CanPlay("'video/mp4; codecs=\"vp9, opus\"'"));
+  EXPECT_EQ(kTheoraAndPropProbably,
+            CanPlay("'video/mp4; codecs=\"theora, vorbis\"'"));

[ddorwin, 2014/03/20 18:04:50]

I wonder if Chrome actually can play these unexpected combinations.

+  EXPECT_EQ(kTheoraAndPropProbably,
+            CanPlay("'video/mp4; codecs=\"theora, mp4a\"'"));
+  EXPECT_EQ(kPropProbably, CanPlay("'video/mp4; codecs=\"avc1, vorbis\"'"));
+  // audio/mpeg
+  EXPECT_EQ(kPropMaybe, CanPlay("'audio/mpeg'"));
+  EXPECT_EQ(kPropProbably, CanPlay("'audio/mpeg; codecs=\"mp4a\"'"));

[ddorwin, 2014/03/20 18:04:50]

According to [1], this is for mp3. Thus, please add a TODO as mentioned on line
220.

[1]
https://code.google.com/p/chromium/codesearch#chromium/src/net/base/mime_util...

+  EXPECT_EQ(kPropProbably, CanPlay("'audio/mpeg; codecs=\"avc1\"'"));
+  EXPECT_EQ(kOpusAndPropProbably, CanPlay("'audio/mpeg; codecs=\"opus\"'"));
+  EXPECT_EQ(kPropProbably, CanPlay("'audio/mpeg; codecs=\"vorbis\"'"));
+  EXPECT_EQ(kTheoraAndPropProbably, CanPlay("'audio/mpeg; codecs=\"theora\"'"));
+  EXPECT_EQ(kPropProbably, CanPlay("'audio/mpeg; codecs=\"vp8\"'"));
+  // audio/mp3
+  EXPECT_EQ(kPropMaybe, CanPlay("'audio/mp3'"));
+  EXPECT_EQ(kPropProbably, CanPlay("'audio/mp3; codecs=\"mp4a\"'"));

[ddorwin, 2014/03/20 18:04:50]

This is a bug. I think any codecs with audio/mp3 should return kNot. If so,
please file and add a TODO referencing it.

[amogh.bihani, 2014/03/21 06:27:08]

My other CL will take care of it. (line 443-445 of that CL[1])

---------
[1] https://codereview.chromium.org/150653008/diff/620001/net/base/mime_util.cc

+  EXPECT_EQ(kPropProbably, CanPlay("'audio/mp3; codecs=\"avc1\"'"));
+  EXPECT_EQ(kOpusAndPropProbably, CanPlay("'audio/mp3; codecs=\"opus\"'"));
+  EXPECT_EQ(kPropProbably, CanPlay("'audio/mp3; codecs=\"vorbis\"'"));
+  EXPECT_EQ(kTheoraAndPropProbably, CanPlay("'audio/mp3; codecs=\"theora\"'"));
+  EXPECT_EQ(kPropProbably, CanPlay("'audio/mp3; codecs=\"vp8\"'"));
+  // audio/mp4

[ddorwin, 2014/03/20 18:04:50]

Move audio/mp4 up after video/mp4.

Actually, mp4 is sufficiently interesting, that it probably deserves its own
test. Then, mpeg and mp3 could be in the mpeg test.

[amogh.bihani, 2014/03/21 13:52:03]

Done.

+  EXPECT_EQ(kPropMaybe, CanPlay("'audio/mp4'"));
+  EXPECT_EQ(kPropProbably, CanPlay("'audio/mp4; codecs=\"mp4a\"'"));
+  EXPECT_EQ(kPropMaybe, CanPlay("'audio/mp4; codecs=\"mp4a.40.2\"'"));
+  EXPECT_EQ(kPropProbably, CanPlay("'audio/mp4; codecs=\"avc1\"'"));

[ddorwin, 2014/03/20 18:04:50]

As mentioned earlier, video codecs probably shouldn't be allowed with "audio/*".

[amogh.bihani, 2014/03/21 06:27:08]

My other CL will take care of these :)

(Wow... that CL takes care of a lot of things :D)

+  EXPECT_EQ(kPropProbably, CanPlay("'audio/mp4; codecs=\"avc3\"'"));
+  EXPECT_EQ(kPropMaybe, CanPlay("'audio/mp4; codecs=\"avc1.4D401E\"'"));
+  EXPECT_EQ(kOpusAndPropProbably, CanPlay("'audio/mp4; codecs=\"opus\"'"));
+  EXPECT_EQ(kPropProbably, CanPlay("'audio/mp4; codecs=\"vorbis\"'"));
+  EXPECT_EQ(kTheoraAndPropProbably, CanPlay("'audio/mp4; codecs=\"theora\"'"));
+  EXPECT_EQ(kPropProbably, CanPlay("'audio/mp4; codecs=\"vp8\"'"));
+  EXPECT_EQ(kOpusAndPropProbably, CanPlay("'audio/mp4; codecs=\"vp9, opus\"'"));
+  EXPECT_EQ(kTheoraAndPropProbably,
+            CanPlay("'audio/mp4; codecs=\"theora, vorbis\"'"));
+  EXPECT_EQ(kTheoraAndPropProbably,
+            CanPlay("'audio/mp4; codecs=\"theora, mp4a\"'"));
+  EXPECT_EQ(kPropProbably, CanPlay("'audio/mp4; codecs=\"avc1, vorbis\"'"));
+}
+

[ddorwin, 2014/03/20 18:04:50]

This is a good set of tests. I see it's still missing some less used container
variants from
https://code.google.com/p/chromium/codesearch#chromium/src/net/base/mime_util...

This includes:
"application/ogg"
HLS
"x-..." variants

[amogh.bihani, 2014/03/21 13:52:03]

Done.

+}  // namespace content