Add autoresize capability to chromium.

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 b16c5ba7b80c0d750a574b2726119d4e4425b2a7..98da1c23fb31ee28b7dc55f02e1bdadc64736ed4 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -924,6 +924,10 @@ void RenderWidget::didScrollRect(int dx, int dy, const WebRect& clip_rect) {
       FROM_HERE, base::Bind(&RenderWidget::InvalidationCallback, this));
 }
 
+void RenderWidget::didAutoResize(const WebSize& new_size) {
+  size_ = new_size;
+}
+
 void RenderWidget::didActivateCompositor(int compositor_identifier) {
   TRACE_EVENT0("gpu", "RenderWidget::didActivateCompositor");