Pipe "is pinned to left/right", "has horizontal/vertical scrollbar",

"number of wheel handlers" to browser process.

We want to implement two-finger-swipe for history like safari does on
os x lion. The way this works is:
* If a page has no horizontal scrollbars, or the page is all the way
  to the left, scrolling to the left will go back in history instead.
* Same for right/forward.

Hence, this data needs to be available in the browser process.

This is modelled after the WebKit2 functions
WKPageIsPinnedToLeftSide(), WKPageIsPinnedToRightSide(),
WKPageHasHorizontalScrollbar(), and
webPageProxy::willHandleHorizontalScrollEvents().

Depends on https://bugs.webkit.org/show_bug.cgi?id=66094

BUG=90228
TEST=No observable effect yet


Review URL: http://codereview.chromium.org/7635011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@96670 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 5 insertions, 0 deletions

diff --git a/content/browser/renderer_host/render_view_host.h b/content/browser/renderer_host/render_view_host.h
index 17f560a..d5566c0 100644
--- a/content/browser/renderer_host/render_view_host.h
+++ b/content/browser/renderer_host/render_view_host.h
@@ -430,6 +430,11 @@ class RenderViewHost : public RenderWidgetHost {
   void OnMsgOpenURL(const GURL& url, const GURL& referrer,
                     WindowOpenDisposition disposition);
   void OnMsgDidContentsPreferredSizeChange(const gfx::Size& new_size);
+  void OnMsgDidChangeScrollbarsForMainFrame(bool has_horizontal_scrollbar,
+                                            bool has_vertical_scrollbar);
+  void OnMsgDidChangeScrollOffsetPinningForMainFrame(bool is_pinned_to_left,
+                                                     bool is_pinned_to_right);
+  void OnMsgDidChangeNumWheelEvents(int count);
   void OnMsgSelectionChanged(const std::string& text, const ui::Range& range,
                              const gfx::Point& start, const gfx::Point& end);
   void OnMsgPasteFromSelectionClipboard();