Browser Plugin: Implement AutoSize

content/renderer/render_widget.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/render_widget.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
@@ skipping 1138 matching lines @@
   //    the work that we will need to do.
   invalidation_task_posted_ = true;
   MessageLoop::current()->PostTask(
       FROM_HERE, base::Bind(&RenderWidget::InvalidationCallback, this));
 }
 
 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();
   }
 }
 
 void RenderWidget::didActivateCompositor(int input_handler_identifier) {
   TRACE_EVENT0("gpu", "RenderWidget::didActivateCompositor");
 
 #if !defined(OS_MACOSX)
   if (!is_accelerated_compositing_active_) {
     // When not in accelerated compositing mode, in certain cases (e.g. waiting
     // for a resize or if no backing store) the RenderWidgetHost is blocking the
@@ skipping 753 matching lines @@
 bool RenderWidget::WillHandleGestureEvent(
     const WebKit::WebGestureEvent& event) {
   return false;
 }
 
 bool RenderWidget::WebWidgetHandlesCompositorScheduling() const {
   return false;
 }
 
 }  // namespace content