Make delegated software renderer work on Mac

content/renderer/gpu/compositor_software_output_device.cc

 // Copyright (c) 2013 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 "content/renderer/gpu/compositor_software_output_device.h"
 
 #include "base/logging.h"
 #include "cc/output/software_frame_data.h"
 #include "content/child/child_shared_bitmap_manager.h"
 #include "content/renderer/render_process.h"
@@ skipping 76 matching lines @@
   for (size_t i = 0; i < buffers_.size(); ++i) {
     size_t index = (hint + i) % buffers_.size();
     if (buffers_[index]->free())
       return index;
   }
 
   buffers_.push_back(CreateBuffer());
   return buffers_.size() - 1;
 }
 
-void CompositorSoftwareOutputDevice::Resize(const gfx::Size& viewport_size) {
+void CompositorSoftwareOutputDevice::Resize(
+    const gfx::Size& viewport_pixel_size,
+    float scale_factor) {
   DCHECK(CalledOnValidThread());
 
-  if (viewport_size_ == viewport_size)
+  scale_factor_ = scale_factor;
+
+  if (viewport_size_ == viewport_pixel_size)
     return;
 
   // Keep non-ACKed buffers in awaiting_ack_ until they get acknowledged.
   for (size_t i = 0; i < buffers_.size(); ++i) {
     if (!buffers_[i]->free()) {
       awaiting_ack_.push_back(buffers_[i]);
       buffers_[i] = NULL;
     }
   }
 
   buffers_.clear();
   current_index_ = -1;
-  viewport_size_ = viewport_size;
+  viewport_size_ = viewport_pixel_size;
 }
 
 void CompositorSoftwareOutputDevice::DiscardBackbuffer() {
   // Keep non-ACKed buffers in awaiting_ack_ until they get acknowledged.
   for (size_t i = 0; i < buffers_.size(); ++i) {
     if (!buffers_[i]->free()) {
       awaiting_ack_.push_back(buffers_[i]);
       buffers_[i] = NULL;
     }
   }
@@ skipping 92 matching lines @@
     return;
   } else {
     it = std::find_if(awaiting_ack_.begin(), awaiting_ack_.end(),
                       CompareById(id));
     DCHECK(it != awaiting_ack_.end());
     awaiting_ack_.erase(it);
   }
 }
 
 }  // namespace content