Place DevTools WebContents underneath inspected WebContents.

This commit has this strategy implemented on Mac.

See https://code.google.com/p/chromium/issues/detail?id=318751.

brightray/browser/devtools_contents_resizing_strategy.h

@@ -0,0 +1,56 @@
+// 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.
+
+#ifndef BRIGHTRAY_BROWSER_DEVTOOLS_CONTENTS_RESIZING_STRATEGY_H_
+#define BRIGHTRAY_BROWSER_DEVTOOLS_CONTENTS_RESIZING_STRATEGY_H_
+
+#include "base/basictypes.h"
+#include "ui/gfx/insets.h"
+#include "ui/gfx/rect.h"
+#include "ui/gfx/size.h"
+
+// This class knows how to resize both DevTools and inspected WebContents
+// inside a browser window hierarchy.
+class DevToolsContentsResizingStrategy {
+ public:
+  DevToolsContentsResizingStrategy();
+  DevToolsContentsResizingStrategy(
+      const gfx::Insets& insets,
+      const gfx::Size& min_size);
+  explicit DevToolsContentsResizingStrategy(const gfx::Rect& bounds);
+
+  void CopyFrom(const DevToolsContentsResizingStrategy& strategy);
+  bool Equals(const DevToolsContentsResizingStrategy& strategy);
+
+  const gfx::Insets& insets() const { return insets_; }
+  const gfx::Size& min_size() const { return min_size_; }
+  const gfx::Rect& bounds() const { return bounds_; }
+
+ private:
+  // Insets of contents inside DevTools.
+  gfx::Insets insets_;
+
+  // Minimum size of contents.
+  gfx::Size min_size_;
+
+  // Contents bounds. When non-empty, used instead of insets.
+  gfx::Rect bounds_;
+
+  DISALLOW_COPY_AND_ASSIGN(DevToolsContentsResizingStrategy);
+};
+
+// Applies contents resizing strategy, producing bounds for devtools and
+// page contents views. Generally, page contents view is placed atop of devtools
+// inside a common parent view, which size should be passed in |container_size|.
+// When unknown, providing empty rect as previous devtools and contents bounds
+// is allowed.
+void ApplyDevToolsContentsResizingStrategy(
+    const DevToolsContentsResizingStrategy& strategy,
+    const gfx::Size& container_size,
+    const gfx::Rect& old_devtools_bounds,
+    const gfx::Rect& old_contents_bounds,
+    gfx::Rect* new_devtools_bounds,
+    gfx::Rect* new_contents_bounds);
+
+#endif  // BRIGHTRAY_BROWSER_DEVTOOLS_CONTENTS_RESIZING_STRATEGY_H_