This tunes up some of the snapshot creation code.

Includes:

- Makes it so that the PaintAtSize message does what it should do:
  render the page at the size given and then scale (in the render
  process) the result to the desired size.

- Changed some of the timeouts for updating snapshots to help with
  performance

- Reduced the number of cases where we refresh snapshots in response
  to tabs changing.

- Removed the need to force updates whenever we switch to overview
  mode, which makes it faster, and avoids the "shuffling" effect.

- Started listening to TAB_CONTENTS_CONNECTED in order to detect new
  browsers, instead of BROWSER_WINDOW_READY, because there were still
  times when the tab contents didn't have any dimensions by the time
  BROWSER_WINDOW_READY was sent.  This helps fix the bug referenced
  below.

- Stopped updating snapshots in active mode.  Now we just invalidate
  the snapshots and render them when we enter overview mode.

- Added a parameter to indicate whether we prefer using the backing
  store or not when asking for snapshots from the thumbnail generator.

- Added tracking of a timestamp for events from the window manager so
  we can avoid racing.

TEST=ran in chromeos under WM and verified snapshot contents
BUG=chromium-os:3142, 3136
Review URL: http://codereview.chromium.org/2098006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@48544 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 1 insertions, 0 deletions

diff --git a/chrome/renderer/render_widget.h b/chrome/renderer/render_widget.h
index 4232d28..4086137 100644
--- a/chrome/renderer/render_widget.h
+++ b/chrome/renderer/render_widget.h
@@ -162,6 +162,7 @@ class RenderWidget : public IPC::Channel::Listener,
                            int target_start, int target_end,
                            const string16& ime_string);
   void OnMsgPaintAtSize(const TransportDIB::Handle& dib_id,
+                        const gfx::Size& page_size,
                         const gfx::Size& desired_size);
   void OnMsgRepaint(const gfx::Size& size_to_paint);
   void OnSetTextDirection(WebKit::WebTextDirection direction);