Add support for begin frame scheduling and direct rendering when GPU compositing is disabled (issue #1368).

- Always set the browser process VSync rate (frame rate) to CefSettings.windowless_frame_rate.
- When the `enable-begin-frame-scheduling` command-line flag is specified the VSync rate for all processes will be synchronized to CefSettings.windowless_frame_rate. This flag cannot be used in combination with windowed rendering.
- When the `disable-gpu` and `disable-gpu-compositing` command-line flags are specified the CefRenderHandler::OnPaint method will be called directly from the compositor instead of requiring an additional copy for each frame.
- CefRenderHandler::OnPopupSize now passes view coordinates instead of (potentially scaled) pixel coordinates.
- Add OSR unit tests for 2x (HiDPI) pixel scaling.
- Improve CefRenderHandler documentation.

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@1960 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

patch/patch.cfg

@@ -67,6 +67,12 @@ patches = [
     'name': 'public_browser_1161_1257',
     'path': '../content/public/browser/',
   },
+  {
+    # Allow creation of a custom SoftwareOutputDevice.
+    # http://code.google.com/p/chromiumembedded/issues/detail?id=1368
+    'name': 'compositor_1368',
+    'path': '../',
+  },
   {
     # Allow specification of a custom WebContentsView.
     # http://code.google.com/p/chromiumembedded/issues/detail?id=1257