Clobber frame_data->device_scale_factor to 1 on Android.

android_webview/browser/hardware_renderer.cc

 // Copyright 2014 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 "android_webview/browser/hardware_renderer.h"
 
 #include "android_webview/browser/aw_gl_surface.h"
 #include "android_webview/browser/deferred_gpu_command_service.h"
 #include "android_webview/browser/parent_output_surface.h"
 #include "android_webview/browser/shared_renderer_state.h"
@@ skipping 136 matching lines @@
   scoped_ptr<DrawGLInput> input = shared_renderer_state_->PassDrawGLInput();
   if (!resource_collection_.get()) {
     resource_collection_ = new cc::DelegatedFrameResourceCollection;
     resource_collection_->SetClient(this);
   }
 
   if (input.get()) {
     DCHECK(!input->frame.gl_frame_data);
     DCHECK(!input->frame.software_frame_data);
 
+    // DelegatedRendererLayerImpl applies the inverse device_scale_factor of the
+    // renderer frame, assuming that the browser compositor will scale
+    // it back up to device scale.  But on Android we put our browser layers in
+    // physical pixels and set our browser CC device_scale_factor to 1, so this
+    // suppresses the transform.
+    input->frame.delegated_frame_data->device_scale_factor = 1.0f;
+
     bool size_changed =
         input->width != view_width_ || input->height != view_height_;
     view_width_ = input->width;
     view_height_ = input->height;
     scroll_offset_ = input->scroll_offset;
 
     if (!frame_provider_ || size_changed) {
       if (delegated_layer_) {
         delegated_layer_->RemoveFromParent();
       }
@@ skipping 50 matching lines @@
 }
 
 void HardwareRenderer::UnusedResourcesAreAvailable() {
   cc::ReturnedResourceArray returned_resources;
   resource_collection_->TakeUnusedResourcesForChildCompositor(
       &returned_resources);
   shared_renderer_state_->InsertReturnedResources(returned_resources);
 }
 
 }  // namespace android_webview