media: Support better decoder switching

media/base/mock_filters.cc

Index: media/base/mock_filters.cc
diff --git a/media/base/mock_filters.cc b/media/base/mock_filters.cc
index c088b57bf3e4c9e33710cee5f37bffa957bde9d1..3625ebd7b3160bfcd00ef50a156ee8f210f8791a 100644
--- a/media/base/mock_filters.cc
+++ b/media/base/mock_filters.cc
@@ -88,24 +88,26 @@ VideoRotation MockDemuxerStream::video_rotation() {
   return VIDEO_ROTATION_0;
 }
 
-std::string MockVideoDecoder::GetDisplayName() const {
-  return "MockVideoDecoder";
-}
-
-MockVideoDecoder::MockVideoDecoder() {
+MockVideoDecoder::MockVideoDecoder(const std::string& decoder_name)
+    : decoder_name_(decoder_name) {
   ON_CALL(*this, CanReadWithoutStalling()).WillByDefault(Return(true));
 }
 
-std::string MockAudioDecoder::GetDisplayName() const {
-  return "MockAudioDecoder";
-}
-
 MockVideoDecoder::~MockVideoDecoder() {}
 
-MockAudioDecoder::MockAudioDecoder() {}
+std::string MockVideoDecoder::GetDisplayName() const {
+  return decoder_name_;
+}
+
+MockAudioDecoder::MockAudioDecoder(const std::string& decoder_name)
+    : decoder_name_(decoder_name) {}
 
 MockAudioDecoder::~MockAudioDecoder() {}
 
+std::string MockAudioDecoder::GetDisplayName() const {
+  return decoder_name_;
+}
+
 MockRendererClient::MockRendererClient() {}
 
 MockRendererClient::~MockRendererClient() {}