Introduce painted-device-scale-factor and use it when --enable-use-zoom-for-dsf is specified.

content/browser/renderer_host/render_process_host_impl.cc

 // Copyright 2012 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.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "content/browser/renderer_host/render_process_host_impl.h"
 
 #include <algorithm>
@@ skipping 1287 matching lines @@
     switches::kEnableRendererMojoChannel,
     switches::kEnableRTCSmoothnessAlgorithm,
     switches::kEnableSeccompFilterSandbox,
     switches::kEnableSkiaBenchmarking,
     switches::kEnableSlimmingPaintV2,
     switches::kEnableSmoothScrolling,
     switches::kEnableStatsTable,
     switches::kEnableThreadedCompositing,
     switches::kEnableTouchDragDrop,
     switches::kEnableUnsafeES3APIs,
+    switches::kEnableUseZoomForDSF,
     switches::kEnableViewport,
     switches::kEnableVtune,
     switches::kEnableWebBluetooth,
     switches::kEnableWebGLDraftExtensions,
     switches::kEnableWebGLImageChromium,
     switches::kEnableWebVR,
     switches::kExplicitlyAllowedPorts,
     switches::kForceDeviceScaleFactor,
     switches::kForceDisplayList2dCanvas,
     switches::kForceOverlayFullscreenVideo,
@@ skipping 1238 matching lines @@
 void RenderProcessHostImpl::GetAudioOutputControllers(
     const GetAudioOutputControllersCallback& callback) const {
   audio_renderer_host()->GetOutputControllers(callback);
 }
 
 BluetoothDispatcherHost* RenderProcessHostImpl::GetBluetoothDispatcherHost() {
   return bluetooth_dispatcher_host_.get();
 }
 
 }  // namespace content