[Refactor] Move code for painting the window header for browser windows out of ash

ash/frame/header_painter_util.cc

Index: ash/frame/header_painter_util.cc
diff --git a/ash/frame/header_painter_util.cc b/ash/frame/header_painter_util.cc
new file mode 100644
index 0000000000000000000000000000000000000000..77123e6f4f8d2f93af26b03324dbb49139e6c265
--- /dev/null
+++ b/ash/frame/header_painter_util.cc
@@ -0,0 +1,107 @@
+// Copyright 2014 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/frame/header_painter_util.h"
+
+#include <algorithm>
+
+#include "ui/aura/window.h"
+#include "ui/compositor/layer.h"
+#include "ui/compositor/layer_animator.h"
+#include "ui/gfx/font_list.h"
+#include "ui/gfx/rect.h"
+#include "ui/views/view.h"
+#include "ui/views/widget/widget.h"
+
+namespace {
+
+// Radius of the header's top corners when the window is restored.
+const int kTopCornerRadiusWhenRestored = 2;
+
+// Distance between left edge of the window and the header icon.
+const int kIconXOffset = 9;
+
+// Height and width of header icon.
+const int kIconSize = 16;
+
+// Space between the title text and the caption buttons.
+const int kTitleCaptionButtonSpacing = 5;
+
+// Space between window icon and title text.
+const int kTitleIconOffsetX = 5;
+
+// Space between window edge and title text, when there is no icon.
+const int kTitleNoIconOffsetX = 8;
+
+// In the pre-Ash era the web content area had a frame along the left edge, so
+// user-generated theme images for the new tab page assume they are shifted
+// right relative to the header.  Now that we have removed the left edge frame
+// we need to copy the theme image for the window header from a few pixels
+// inset to preserve alignment with the NTP image, or else we'll break a bunch
+// of existing themes.  We do something similar on OS X for the same reason.
+const int kThemeFrameImageInsetX = 5;
+
+}  // namespace
+
+namespace ash {
+
+// static
+int HeaderPainterUtil::GetTopCornerRadiusWhenRestored() {
+  return kTopCornerRadiusWhenRestored;
+}
+
+// static
+int HeaderPainterUtil::GetIconXOffset() {
+  return kIconXOffset;
+}
+
+// static
+int HeaderPainterUtil::GetIconSize() {
+  return kIconSize;
+}
+
+// static
+int HeaderPainterUtil::GetThemeBackgroundXInset() {
+  return kThemeFrameImageInsetX;
+}
+
+// static
+gfx::Rect HeaderPainterUtil::GetTitleBounds(
+    const views::View* icon,
+    const views::View* caption_button_container,
+    const gfx::FontList& title_font_list) {
+  int x = icon ?
+      icon->bounds().right() + kTitleIconOffsetX : kTitleNoIconOffsetX;
+  int height = title_font_list.GetHeight();
+  int y = std::max(
+      0,
+      static_cast<int>(std::ceil(
+          (caption_button_container->height() - height) / 2.0f)));
+  int width = std::max(
+      0, caption_button_container->x() - kTitleCaptionButtonSpacing - x);
+  return gfx::Rect(x, y, width, height);
+}
+
+// static
+bool HeaderPainterUtil::CanAnimateActivation(views::Widget* widget) {
+  // Do not animate the header if the parent (e.g.
+  // kShellWindowId_DefaultContainer) is already animating. All of the
+  // implementers of HeaderPainter animate activation by continuously painting
+  // during the animation. This gives the parent's animation a slower frame
+  // rate.
+  // TODO(sky): Expose a better way to determine this rather than assuming the
+  // parent is a toplevel container.
+  aura::Window* window = widget->GetNativeWindow();
+  if (!window->parent())
+    return true;
+
+  ui::LayerAnimator* parent_layer_animator =
+      window->parent()->layer()->GetAnimator();
+  return !parent_layer_animator->IsAnimatingProperty(
+             ui::LayerAnimationElement::OPACITY) &&
+         !parent_layer_animator->IsAnimatingProperty(
+             ui::LayerAnimationElement::VISIBILITY);
+}
+
+}  // namespace ash