Encrypted Media: Add TRACE_EVENT to trace eme implementation performance.

webkit/media/crypto/ppapi/clear_key_cdm.cc

 // Copyright (c) 2012 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 "webkit/media/crypto/ppapi/clear_key_cdm.h"
 
 #include <vector>
 
 #include "base/bind.h"
+#include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/time.h"
 #include "media/base/decoder_buffer.h"
 
 #if defined(CLEAR_KEY_CDM_USE_FAKE_AUDIO_DECODER)
 #include "base/basictypes.h"
 static const int64 kNoTimestamp = kint64min;
 #endif  // CLEAR_KEY_CDM_USE_FAKE_AUDIO_DECODER
 
 #if defined(CLEAR_KEY_CDM_USE_FFMPEG_DECODER)
@@ skipping 354 matching lines @@
     output_timestamp_base_in_microseconds_ = kNoTimestamp;
     total_samples_generated_ = 0;
   }
 #endif  // CLEAR_KEY_CDM_USE_FFMPEG_DECODER
 }
 
 cdm::Status ClearKeyCdm::DecryptAndDecodeFrame(
     const cdm::InputBuffer& encrypted_buffer,
     cdm::VideoFrame* decoded_frame) {
   DVLOG(1) << "DecryptAndDecodeFrame()";
+  TRACE_EVENT0("eme", "ClearKeyCdm::DecryptAndDecodeFrame");
 
   scoped_refptr<media::DecoderBuffer> buffer;
   cdm::Status status = DecryptToMediaDecoderBuffer(encrypted_buffer, &buffer);
 
   if (status != cdm::kSuccess)
     return status;
 
 #if defined(CLEAR_KEY_CDM_USE_FFMPEG_DECODER)
   DCHECK(status == cdm::kSuccess);
   DCHECK(buffer);
@@ skipping 167 matching lines @@
 
   static unsigned char color = 0;
   color += 10;
 
   memset(reinterpret_cast<void*>(video_frame->frame_buffer()->data()),
          color, frame_size);
 }
 #endif  // CLEAR_KEY_CDM_USE_FAKE_VIDEO_DECODER
 
 }  // namespace webkit_media