Encrypted Media: Add TRACE_EVENT to trace eme implementation performance.

webkit/plugins/ppapi/ppapi_plugin_instance.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/plugins/ppapi/ppapi_plugin_instance.h"
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
@@ skipping 1902 matching lines @@
   ScopedPPResource encrypted_resource(
       ScopedPPResource::PassRef(),
       MakeBufferResource(pp_instance(),
                          encrypted_buffer->GetData(),
                          encrypted_buffer->GetDataSize()));
   if (!encrypted_buffer->IsEndOfStream() && !encrypted_resource.get())
     return false;
 
   const uint32_t request_id = next_decryption_request_id_++;
   DVLOG(2) << "DecryptAndDecodeVideo() - request_id " << request_id;
+  TRACE_EVENT_ASYNC_BEGIN0(
+      "eme", "PluginInstance::DecryptAndDecodeVideo", request_id);
 
   PP_EncryptedBlockInfo block_info;
   if (!MakeEncryptedBlockInfo(
       encrypted_buffer->GetDecryptConfig(),
       encrypted_buffer->GetTimestamp().InMicroseconds(),
       request_id,
       &block_info)) {
     return false;
   }
 
@@ skipping 812 matching lines @@
   DCHECK(frame_info);
   const uint32_t request_id = frame_info->tracking_info.request_id;
   DVLOG(2) << "DeliverFrame() - request_id: " << request_id;
 
   // If the request ID is not valid or does not match what's saved, do nothing.
   if (request_id == 0 || request_id != pending_video_decode_request_id_) {
     DVLOG(1) << "DeliverFrame() - request_id " << request_id << " not found";
     return;
   }
 
+  TRACE_EVENT_ASYNC_END0(
+      "eme", "PluginInstance::DecryptAndDecodeVideo", request_id);
+
   DCHECK(!pending_video_decode_cb_.is_null());
   pending_video_decode_request_id_ = 0;
   media::Decryptor::VideoDecodeCB video_decode_cb =
       base::ResetAndReturn(&pending_video_decode_cb_);
 
   media::Decryptor::Status status =
       PpDecryptResultToMediaDecryptorStatus(frame_info->result);
   if (status != media::Decryptor::kSuccess) {
     video_decode_cb.Run(status, NULL);
     return;
@@ skipping 462 matching lines @@
   screen_size_for_fullscreen_ = gfx::Size();
   WebElement element = container_->element();
   element.setAttribute(WebString::fromUTF8(kWidth), width_before_fullscreen_);
   element.setAttribute(WebString::fromUTF8(kHeight), height_before_fullscreen_);
   element.setAttribute(WebString::fromUTF8(kBorder), border_before_fullscreen_);
   element.setAttribute(WebString::fromUTF8(kStyle), style_before_fullscreen_);
 }
 
 }  // namespace ppapi
 }  // namespace webkit