Fix render bounds of iframes on devices with a pixel ratio != 1.

sky/engine/core/rendering/RenderIFrame.cpp

 // 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 "sky/engine/config.h"
 
 #include "sky/engine/core/rendering/RenderIFrame.h"
 
 #include "sky/engine/core/editing/FrameSelection.h"
 #include "sky/engine/core/html/HTMLIFrameElement.h"
@@ skipping 15 matching lines @@
     if (view())
         view()->removeIFrame(this);
 }
 
 void RenderIFrame::updateWidgetBounds()
 {
     mojo::View* contentView = toHTMLIFrameElement(node())->contentView();
     if (!contentView)
         return;
 
+    // FIXME: Once viewport_metrics are initialized properly on child views,
+    // The GetRoot() call should be removed.
+    const float devicePixelRatio =
+        contentView->GetRoot()->viewport_metrics().device_pixel_ratio;
+
     IntRect bounds = absoluteContentBox();
     mojo::Rect mojoBounds;
-    mojoBounds.x = bounds.x();
-    mojoBounds.y = bounds.y();
-    mojoBounds.width = bounds.width();
-    mojoBounds.height = bounds.height();
+    mojoBounds.x = bounds.x() * devicePixelRatio;
+    mojoBounds.y = bounds.y() * devicePixelRatio;
+    mojoBounds.width = bounds.width() * devicePixelRatio;
+    mojoBounds.height = bounds.height() * devicePixelRatio;
     contentView->SetBounds(mojoBounds);
 }
 
 void RenderIFrame::paintReplaced(PaintInfo& paintInfo,
                                  const LayoutPoint& paintOffset)
 {
     // Draw a gray background. This should be painted over by the actual
     // content.
     // TODO(mpcomplete): figure out what we should actually do here.
     GraphicsContext* context = paintInfo.context;
 
     IntRect paintRect = pixelSnappedIntRect(LayoutRect(
         paintOffset.x(), paintOffset.y(), contentWidth(), contentHeight()));
     context->setStrokeStyle(SolidStroke);
     context->setStrokeColor(Color::lightGray);
     context->setFillColor(Color::darkGray);
     context->drawRect(paintRect);
 }
 
 } // namespace blink