Send array of paint rects and bitmaps as opposed to a Union

chrome/browser/renderer_host/backing_store.cc

Index: chrome/browser/renderer_host/backing_store.cc
===================================================================
--- chrome/browser/renderer_host/backing_store.cc	(revision 17347)
+++ chrome/browser/renderer_host/backing_store.cc	(working copy)
@@ -51,6 +51,8 @@
 // BackingStoreManager ---------------------------------------------------------
 
 // static
+int BackingStore::kMaxBitmapLengthAllowed = 100000;
+
 BackingStore* BackingStoreManager::GetBackingStore(
     RenderWidgetHost* host,
     const gfx::Size& desired_size) {
@@ -73,13 +75,14 @@
     base::ProcessHandle process_handle,
     TransportDIB* bitmap,
     const gfx::Rect& bitmap_rect,
+    const gfx::Rect& paint_rect,
     bool* needs_full_paint) {
   BackingStore* backing_store = GetBackingStore(host, backing_store_size);
   if (!backing_store) {
     // We need to get Webkit to generate a new paint here, as we
     // don't have a previous snapshot.
-    if (bitmap_rect.size() != backing_store_size ||
-        bitmap_rect.x() != 0 || bitmap_rect.y() != 0) {
+    if (paint_rect.size() != backing_store_size ||
+        paint_rect.x() != 0 || paint_rect.y() != 0) {
       DCHECK(needs_full_paint != NULL);
       *needs_full_paint = true;
     }
@@ -87,7 +90,7 @@
   }
 
   DCHECK(backing_store != NULL);
-  backing_store->PaintRect(process_handle, bitmap, bitmap_rect);
+  backing_store->PaintRect(process_handle, bitmap, bitmap_rect, paint_rect);
   return backing_store;
 }