Adding test data for media unit tests.

media/test/data/README

Index: media/test/data/README
diff --git a/media/test/data/README b/media/test/data/README
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+// Copyright (c) 2011 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.
+
+bear-320x240.webm - WebM encode of bear.1280x720.mp4 resized to 320x240.
+no_streams.webm - Header, Info, & Tracks element from bear-320x240.webm slightly corrupted so it looks 
+                  like there are no tracks.
+nonzero-start-time.webm - Has the same headers as bear-320x240.webm but the first cluster of this file 
+                          is the second cluster of bear-320x240.webm. This creates the situation where
+                          the media data doesn't start at time 0.
+vp8-I-frame-160x240 - The first I frame of a 160x240 reencode of bear-320x240.webm.
+vp8-I-frame-320x120 - The first I frame of a 320x120 reencode of bear-320x240.webm.
+vp8-I-frame-320x240 - The first I frame of bear-320x240.webm.
+vp8-I-frame-320x480 - The first I frame of a 320x480 reencode of bear-320x240.webm.
+vp8-I-frame-640x240 - The first I frame of a 640x240 reencode of bear-320x240.webm.