Add debug shortcuts that toggles options to shows paint rects

ash/debug.cc

Index: ash/debug.cc
diff --git a/ash/debug.cc b/ash/debug.cc
new file mode 100644
index 0000000000000000000000000000000000000000..1f4859134de872dcd927995091b014b61b0d57da
--- /dev/null
+++ b/ash/debug.cc
@@ -0,0 +1,52 @@
+// Copyright (c) 2013 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 "ash/debug.h"
+
+#include "ash/shell.h"
+#include "cc/debug/layer_tree_debug_state.h"
+#include "ui/aura/root_window.h"
+#include "ui/compositor/compositor.h"
+
+namespace ash {
+namespace debug {
+
+void ToggleShowDebugBorders() {
+  Shell::RootWindowList root_windows =
+      Shell::GetInstance()->GetAllRootWindows();
+  for (Shell::RootWindowList::iterator it = root_windows.begin();
+       it != root_windows.end(); ++it) {
+    ui::Compositor* compositor = (*it)->compositor();
+    cc::LayerTreeDebugState state = compositor->GetLayerTreeDebugState();
+    state.show_debug_borders = !state.show_debug_borders;

[piman, 2013/04/23 00:54:30]

it would be better to figure out the right value first (e.g. from the first
window), and set the same thing on each tree.
Otherwise you could run into the case where:
- one tree gets this turned on
- you plug in an external screen, that one doesn't get this turned on
- the toggle key toggles each compositor, meaning you still have one on and one
off - can't have both on or both off.

(same in other functions below)

[oshima, 2013/04/23 01:18:58]

ok, done.

+    compositor->SetLayerTreeDebugState(state);
+  }
+}
+
+void ToggleShowFpsCounter() {
+  Shell::RootWindowList root_windows =
+      Shell::GetInstance()->GetAllRootWindows();
+  for (Shell::RootWindowList::iterator it = root_windows.begin();
+       it != root_windows.end(); ++it) {
+    ui::Compositor* compositor = (*it)->compositor();
+    cc::LayerTreeDebugState state = compositor->GetLayerTreeDebugState();
+    state.show_fps_counter = !state.show_fps_counter;
+    compositor->SetLayerTreeDebugState(state);
+  }
+}
+
+void ToggleShowPaintRects() {
+  Shell::RootWindowList root_windows =
+      Shell::GetInstance()->GetAllRootWindows();
+  for (Shell::RootWindowList::iterator it = root_windows.begin();
+       it != root_windows.end(); ++it) {
+    ui::Compositor* compositor = (*it)->compositor();
+    cc::LayerTreeDebugState state = compositor->GetLayerTreeDebugState();
+    state.show_paint_rects = !state.show_paint_rects;
+    compositor->SetLayerTreeDebugState(state);
+  }
+}
+
+}  // debug
+}  // ash