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..4be77cf1cf4bf32c908ca3fc8a3ea4daf6f5d869 100644
--- a/media/base/mock_filters.cc
+++ b/media/base/mock_filters.cc
@@ -88,24 +88,25 @@ 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_.empty() ? "MockVideoDecoder" : decoder_name_;
+}
 
+MockAudioDecoder::MockAudioDecoder(const std::string& decoder_name)
+    : decoder_name_(decoder_name) {}
 MockAudioDecoder::~MockAudioDecoder() {}
 
+std::string MockAudioDecoder::GetDisplayName() const {
+  return decoder_name_.empty() ? "MockAudioDecoder" : decoder_name_;
+}
+
 MockRendererClient::MockRendererClient() {}
 
 MockRendererClient::~MockRendererClient() {}