Enable MediaCodecVideoDecoder by default.

Bug: 805669
Change-Id: Ibd40c7bde9f913cd3ed75f4c0aa67880716eafbe
Reviewed-on: https://chromium-review.googlesource.com/1017309Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Frank Liberato <liberato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551770}

media/base/media_switches.cc

@@ -235,9 +235,16 @@ const base::Feature kBackgroundVideoPauseOptimization{
 const base::Feature kMemoryPressureBasedSourceBufferGC{
     "MemoryPressureBasedSourceBufferGC", base::FEATURE_DISABLED_BY_DEFAULT};
 
-// Enable MojoVideoDecoder.  Has no effect except on Android currently.
-const base::Feature kMojoVideoDecoder{"MojoVideoDecoder",
-                                      base::FEATURE_DISABLED_BY_DEFAULT};
+// Enable MojoVideoDecoder.  On Android, we use this by default.  Elsewhere,
+// it's experimental.
+const base::Feature kMojoVideoDecoder {
+  "MojoVideoDecoder",
+#if defined(OS_ANDROID)
+      base::FEATURE_ENABLED_BY_DEFAULT
+#else
+      base::FEATURE_DISABLED_BY_DEFAULT
+#endif
+};
 
 // Manage and report MSE buffered ranges by PTS intervals, not DTS intervals.
 const base::Feature kMseBufferByPts{"MseBufferByPts",