Update to Chromium revision 248478.

- Add new CefSettings.windowless_rendering_enabled value that must be enabled when using windowless (off-screen) rendering.
- Improve naming and documentation for CefWindowInfo members.
- CefBeginTracing now completes asynchronously.
- Rename CefEndTracingAsync to CefEndTracing.
- Rename CefCompletionHandler to CefCompletionCallback.

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@1592 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

patch/patches/spi_webcore_364.patch

@@ -1,8 +1,8 @@
 Index: core/frame/FrameView.cpp
 ===================================================================
---- core/frame/FrameView.cpp	(revision 163979)
+--- core/frame/FrameView.cpp	(revision 166298)
 +++ core/frame/FrameView.cpp	(working copy)
-@@ -200,8 +200,10 @@
+@@ -168,8 +168,10 @@
      if (!isMainFrame())
          return;
  
@@ -13,13 +13,13 @@ Index: core/frame/FrameView.cpp
  }
  
  PassRefPtr<FrameView> FrameView::create(Frame* frame)
-Index: platform/mac/NSScrollerImpDetails.mm
+Index: platform/scroll/ScrollbarThemeMacCommon.mm
 ===================================================================
---- platform/mac/NSScrollerImpDetails.mm	(revision 163979)
-+++ platform/mac/NSScrollerImpDetails.mm	(working copy)
-@@ -73,10 +73,14 @@
- 
- bool isScrollbarOverlayAPIAvailable()
+--- platform/scroll/ScrollbarThemeMacCommon.mm	(revision 166298)
++++ platform/scroll/ScrollbarThemeMacCommon.mm	(working copy)
+@@ -369,10 +369,14 @@
+ // static
+ bool ScrollbarThemeMacCommon::isOverlayAPIAvailable()
  {
 +#if 0
      static bool apiAvailable =
@@ -31,4 +31,4 @@ Index: platform/mac/NSScrollerImpDetails.mm
 +#endif
  }
  
- NSScrollerStyle recommendedScrollerStyle()
+ } // namespace WebCore