[Android WebView] Fix DevTools Screencast slowness

content/browser/devtools/renderer_overrides_handler.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/browser/devtools/renderer_overrides_handler.h"
 
 #include <map>
 #include <string>
 
 #include "base/barrier_closure.h"
@@ skipping 25 matching lines @@
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_delegate.h"
 #include "content/public/common/content_client.h"
 #include "content/public/common/page_transition_types.h"
 #include "content/public/common/referrer.h"
 #include "ipc/ipc_sender.h"
 #include "net/base/net_util.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
 #include "ui/gfx/codec/jpeg_codec.h"
 #include "ui/gfx/codec/png_codec.h"
+#include "ui/gfx/display.h"
+#include "ui/gfx/screen.h"
 #include "ui/gfx/size_conversions.h"
 #include "ui/snapshot/snapshot.h"
 #include "url/gurl.h"
 #include "webkit/browser/quota/quota_manager.h"
 
 using blink::WebGestureEvent;
 using blink::WebInputEvent;
 using blink::WebMouseEvent;
 
 namespace content {
@@ skipping 141 matching lines @@
   RenderViewHost* host = agent_->GetRenderViewHost();
   if (!host->GetView())
     return;
 
   last_frame_time_ = base::TimeTicks::Now();
   std::string format;
   int quality = kDefaultScreenshotQuality;
   double scale = 1;
   ParseCaptureParameters(screencast_command_.get(), &format, &quality, &scale);
 
+  const gfx::Display& display =
+      gfx::Screen::GetNativeScreen()->GetPrimaryDisplay();
+  float device_scale_factor = display.device_scale_factor();
+
+  gfx::Rect view_bounds = host->GetView()->GetViewBounds();
+  gfx::Size snapshot_size(gfx::ToCeiledSize(
+      gfx::ScaleSize(view_bounds.size(), scale / device_scale_factor)));
+
   RenderWidgetHostViewBase* view = static_cast<RenderWidgetHostViewBase*>(
       host->GetView());
-
-  gfx::Rect view_bounds = host->GetView()->GetViewBounds();
-  gfx::Size snapshot_size = gfx::ToFlooredSize(
-      gfx::ScaleSize(view_bounds.size(), scale));
-
   view->CopyFromCompositingSurface(
       view_bounds, snapshot_size,
       base::Bind(&RendererOverridesHandler::ScreencastFrameCaptured,
                  weak_factory_.GetWeakPtr(),
                  format, quality, last_compositor_frame_metadata_),
       SkBitmap::kARGB_8888_Config);
 }
 
 void RendererOverridesHandler::ParseCaptureParameters(
     DevToolsProtocol::Command* command,
@@ skipping 769 matching lines @@
       return NULL;
     }
     event.data.pinchUpdate.scale = static_cast<float>(scale);
   }
 
   host->ForwardGestureEvent(event);
   return command->SuccessResponse(NULL);
 }
 
 }  // namespace content