[chromoting] Use zlib as the default encoder and decoder

remoting/base/decoder_zlib.cc

 // Copyright (c) 2010 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 "remoting/base/decoder_zlib.h"
 
 #include "remoting/base/decompressor_zlib.h"
 #include "remoting/base/protocol_util.h"
 
 namespace remoting {
 
 DecoderZlib::DecoderZlib()
     : state_(kWaitingForBeginRect),
       rect_x_(0),
       rect_y_(0),
       rect_width_(0),
       rect_height_(0),
       bytes_per_pixel_(0),
       updated_rects_(NULL),
       row_pos_(0),
       row_y_(0) {
 }
 
 bool DecoderZlib::BeginDecode(scoped_refptr<media::VideoFrame> frame,
-                                  UpdatedRects* updated_rects,
-                                  Task* partial_decode_done,
-                                  Task* decode_done) {
+                              UpdatedRects* updated_rects,
+                              Task* partial_decode_done,
+                              Task* decode_done) {
   DCHECK(!partial_decode_done_.get());
   DCHECK(!decode_done_.get());
   DCHECK(!updated_rects_);
   DCHECK_EQ(kWaitingForBeginRect, state_);
-  CHECK(static_cast<PixelFormat>(frame->format()) == PixelFormatRgb32)
-      << "Only RGB32 is supported";
+
+  if (static_cast<PixelFormat>(frame->format()) != PixelFormatRgb32) {
+    LOG(INFO) << "DecoderZlib only supports RGB32.";
+    return false;
+  }
 
   partial_decode_done_.reset(partial_decode_done);
   decode_done_.reset(decode_done);
   updated_rects_ = updated_rects;
   frame_ = frame;
 
   // Create the decompressor.
   decompressor_.reset(new DecompressorZlib());
   return true;
 }
@@ skipping 90 matching lines @@
   state_ = kWaitingForBeginRect;
 
   updated_rects_->clear();
   updated_rects_->push_back(gfx::Rect(rect_x_, rect_y_,
                                       rect_width_, rect_height_));
   partial_decode_done_->Run();
   return true;
 }
 
 }  // namespace remoting