Allows fullscreen to be triggered with the key events used for scrolling.

cc/trees/layer_tree_host.cc

Index: cc/trees/layer_tree_host.cc
diff --git a/cc/trees/layer_tree_host.cc b/cc/trees/layer_tree_host.cc
index 3bc69bd0db4a4d24bf0e3b70ca896ce7810296bc..8c0733e2fb7f32d95f5719cd8026ff516b0b9306 100644
--- a/cc/trees/layer_tree_host.cc
+++ b/cc/trees/layer_tree_host.cc
@@ -1041,6 +1041,7 @@ void LayerTreeHost::UpdateTopControlsState(TopControlsState constraints,
   if (!settings_.calculate_top_controls_position)
     return;
 
+  top_controls_constraints_ = constraints;
   // Top controls are only used in threaded mode.
   proxy_->ImplThread()->PostTask(
       base::Bind(&TopControlsManager::UpdateTopControlsState,
@@ -1050,6 +1051,23 @@ void LayerTreeHost::UpdateTopControlsState(TopControlsState constraints,
                  animate));
 }
 
+void LayerTreeHost::UpdateTopControlsStatePreservingConstraints(
+    bool show) {
+  if (!settings_.calculate_top_controls_position)
+    return;
+  if (GetTopControlsConstraints() < 0) {
+    LOG(WARNING) << "Called before top controls constraints is set";

[aelias_OOO_until_Jul13, 2013/06/10 05:11:25]

Please remove this log, nobody will ever pay attention to it anyway.

[Jinsuk Kim, 2013/06/10 05:37:09]

Done.

+    return;
+  }
+  proxy_->ImplThread()->PostTask(

[aelias_OOO_until_Jul13, 2013/06/10 05:11:25]

Please call LayerTreeHost::UpdateTopControlsState() from here instead of adding
another PostTask.

[Jinsuk Kim, 2013/06/10 05:37:09]

Done.

+      base::Bind(
+          &TopControlsManager::UpdateTopControlsState,
+          top_controls_manager_weak_ptr_,
+          GetTopControlsConstraints(),
+          show ? cc::SHOWN : cc::HIDDEN,
+          true));
+}
+
 bool LayerTreeHost::BlocksPendingCommit() const {
   if (!root_layer_.get())
     return false;