Combine ViewHostMsg_{Paint,Scroll}Rect into one IPC....

chrome/browser/renderer_host/render_widget_host_view_gtk.cc

Index: chrome/browser/renderer_host/render_widget_host_view_gtk.cc
===================================================================
--- chrome/browser/renderer_host/render_widget_host_view_gtk.cc	(revision 34937)
+++ chrome/browser/renderer_host/render_widget_host_view_gtk.cc	(working copy)
@@ -505,21 +505,27 @@
   key_bindings_handler_->set_enabled(control != IME_DISABLE);
 }
 
-void RenderWidgetHostViewGtk::DidPaintRect(const gfx::Rect& rect) {
+void RenderWidgetHostViewGtk::DidPaintBackingStoreRects(
+    const std::vector<gfx::Rect>& rects) {
   if (is_hidden_)
     return;
 
-  if (about_to_validate_and_paint_)
-    invalid_rect_ = invalid_rect_.Union(rect);
-  else
-    Paint(rect);
+  for (size_t i = 0; i < rects.size(); ++i) {
+    if (about_to_validate_and_paint_) {
+      invalid_rect_ = invalid_rect_.Union(rects[i]);
+    } else {
+      Paint(rects[i]);
+    }
+  }
 }
 
-void RenderWidgetHostViewGtk::DidScrollRect(const gfx::Rect& rect, int dx,
-                                            int dy) {
+void RenderWidgetHostViewGtk::DidScrollBackingStoreRect(const gfx::Rect& rect,
+                                                        int dx, int dy) {
   if (is_hidden_)
     return;
 
+  // TODO(darin): Implement the equivalent of Win32's ScrollWindowEX.  Can that
+  // be done using XCopyArea?  Perhaps similar to BackingStore::ScrollRect?
   Paint(rect);
 }