Make base::Timer sequence-friendly.

media/base/android/media_codec_loop.cc

Index: media/base/android/media_codec_loop.cc
diff --git a/media/base/android/media_codec_loop.cc b/media/base/android/media_codec_loop.cc
index cf470480650d9cd24a1dbf287b34ff804aea07e7..e907b2ce8ea6c937e484e1032d41d845f34c6f9c 100644
--- a/media/base/android/media_codec_loop.cc
+++ b/media/base/android/media_codec_loop.cc
@@ -38,15 +38,15 @@ MediaCodecLoop::MediaCodecLoop(
     int sdk_int,
     Client* client,
     std::unique_ptr<MediaCodecBridge> media_codec,
-    scoped_refptr<base::SingleThreadTaskRunner> task_runner)
+    scoped_refptr<base::SingleThreadTaskRunner> timer_task_runner)
     : state_(STATE_READY),
       client_(client),
       media_codec_(std::move(media_codec)),
       pending_input_buf_index_(kInvalidBufferIndex),
       sdk_int_(sdk_int),
       weak_factory_(this) {
-  if (task_runner)
-    io_timer_.SetTaskRunner(task_runner);
+  if (timer_task_runner)
+    io_timer_.SetTaskRunner(timer_task_runner);
   // TODO(liberato): should this DCHECK?
   if (media_codec_ == nullptr)
     SetState(STATE_ERROR);