Browser Plugin: Implement AutoSize

content/renderer/render_widget.cc

Index: content/renderer/render_widget.cc
diff --git a/content/renderer/render_widget.cc b/content/renderer/render_widget.cc
index ce2385bbe0ad6bcb9e6b09860093f17831828c88..5c154980adf026037fbe6e5948da60cf54d4127f 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -1156,6 +1156,11 @@ void RenderWidget::didAutoResize(const WebSize& new_size) {
   if (size_.width() != new_size.width || size_.height() != new_size.height) {
     size_ = new_size;
     need_update_rect_for_auto_resize_ = true;
+    // If we don't clear PaintAggregator after changing autoResize state, then
+    // we might end up in a situation where bitmap_rect is larger than the
+    // view_size. By clearing PaintAggregator, we ensure that we don't end up
+    // with invalid damage rects.
+    paint_aggregator_.ClearPendingUpdate();
   }
 }