Merge 126042 - [chromium] pepper plugins sometimes are shifted by 1 pixel

Merge 126042 - [chromium] pepper plugins sometimes are shifted by 1 pixel
https://bugs.webkit.org/show_bug.cgi?id=94257

Patch by Yuzhu Shen <yzshen@chromium.com>; on 2012-08-20
Reviewed by Levi Weintraub.

Change RenderWidget::updateWidgetGeometry() to use LayoutRect instead of IntRect to avoid unwanted truncation
(when converting from FloatRect to IntRect).

This makes sure that the optimized rendering code path of Pepper plugin
(PluginInstance::GetBitmapForOptimizedPluginPaint) has consistent coordinates with the normal WebKit rendering
code path.

No new tests because we don't have Pepper plugin tests in WebKit.

* rendering/RenderWidget.cpp:
(WebCore::RenderWidget::updateWidgetGeometry):

TBR=commit-queue@webkit.org
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=126614