Allow non integer device scale factors in render widget

content/browser/renderer_host/render_process_host_impl.cc

 // Copyright (c) 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"
 
 #if defined(OS_WIN)
@@ skipping 689 matching lines @@
     // Allow this to be set when invoking the browser and relayed along.
     switches::kEnableSandboxLogging,
 #endif
     switches::kEnableSeccompSandbox,
     switches::kEnableStatsTable,
     switches::kEnableThreadedCompositing,
     switches::kDisableThreadedCompositing,
     switches::kEnableTouchEvents,
     switches::kEnableVideoTrack,
     switches::kEnableViewport,
+    switches::kForceDeviceScaleFactor,
     switches::kFullMemoryCrashReport,
 #if !defined (GOOGLE_CHROME_BUILD)
     // These are unsupported and not fully tested modes, so don't enable them
     // for official Google Chrome builds.
     switches::kInProcessPlugins,
 #endif  // GOOGLE_CHROME_BUILD
     switches::kInProcessWebGL,
     switches::kJavaScriptFlags,
     switches::kLoggingLevel,
     switches::kNewCheckboxStyle,
@@ skipping 652 matching lines @@
       uint64 surface_handle,
       int32 route_id,
       int32 gpu_process_host_id) {
   TRACE_EVENT0("renderer_host",
                "RenderWidgetHostImpl::OnCompositorSurfaceBuffersSwappedNoHost");
   RenderWidgetHostImpl::AcknowledgeSwapBuffers(route_id,
                                                gpu_process_host_id);
 }
 
 }  // namespace content