Cast: Use fixed bitrate and set it once for hardware encoder

media/cast/test/fake_video_encode_accelerator.cc

Index: media/cast/test/fake_video_encode_accelerator.cc
diff --git a/media/cast/test/fake_video_encode_accelerator.cc b/media/cast/test/fake_video_encode_accelerator.cc
index d1bfab339d04af5249dcf02d7a504d2456c48c1b..a391a9a81c6082cf42a60b420eaa3fc7339621db 100644
--- a/media/cast/test/fake_video_encode_accelerator.cc
+++ b/media/cast/test/fake_video_encode_accelerator.cc
@@ -17,11 +17,15 @@ static const unsigned int kMinimumInputCount = 1;
 static const size_t kMinimumOutputBufferSize = 123456;
 
 FakeVideoEncodeAccelerator::FakeVideoEncodeAccelerator(
-    const scoped_refptr<base::SingleThreadTaskRunner>& task_runner)
+    const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
+    std::vector<uint32>* stored_bitrates)
     : task_runner_(task_runner),
+      stored_bitrates_(stored_bitrates),
       client_(NULL),
       first_(true),
-      weak_this_factory_(this) {}
+      weak_this_factory_(this) {
+  DCHECK(stored_bitrates_);
+}
 
 FakeVideoEncodeAccelerator::~FakeVideoEncodeAccelerator() {
   weak_this_factory_.InvalidateWeakPtrs();
@@ -80,7 +84,7 @@ void FakeVideoEncodeAccelerator::UseOutputBitstreamBuffer(
 void FakeVideoEncodeAccelerator::RequestEncodingParametersChange(
     uint32 bitrate,
     uint32 framerate) {
-  // No-op.
+  stored_bitrates_->push_back(bitrate);
 }
 
 void FakeVideoEncodeAccelerator::Destroy() { delete this; }