[DevTools] Use special resizing strategy instead of insets.

chrome/browser/devtools/devtools_contents_resizing_strategy.cc

Index: chrome/browser/devtools/devtools_contents_resizing_strategy.cc
diff --git a/chrome/browser/devtools/devtools_contents_resizing_strategy.cc b/chrome/browser/devtools/devtools_contents_resizing_strategy.cc
new file mode 100644
index 0000000000000000000000000000000000000000..d854e3974bd2996ced9926c2257fb2ab94fe6a03
--- /dev/null
+++ b/chrome/browser/devtools/devtools_contents_resizing_strategy.cc
@@ -0,0 +1,51 @@
+// 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 "chrome/browser/devtools/devtools_contents_resizing_strategy.h"
+#include <cstdio>
+
+DevToolsContentsResizingStrategy::DevToolsContentsResizingStrategy() {
+}
+
+DevToolsContentsResizingStrategy::DevToolsContentsResizingStrategy(
+    gfx::Insets insets, gfx::Size min_size)
+    : insets_(insets),
+      min_size_(min_size) {
+}
+
+void DevToolsContentsResizingStrategy::Apply(
+    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) {
+  new_devtools_bounds->SetRect(
+      0, 0, container_size.width(), container_size.height());
+
+  int width = std::max(0, container_size.width() - insets_.width());
+  int left = insets_.left();
+  if (width < min_size_.width() && insets_.width() > 0) {
+    int min_width = std::min(min_size_.width(), container_size.width());
+    int insets_width = container_size.width() - min_width;
+    int insets_decrease = insets_.width() - insets_width;
+    // Decrease both left and right insets proportionally.
+    left -= insets_decrease * insets_.left() / insets_.width();
+    width = min_width;
+  }
+  left = std::max(0, std::min(container_size.width(), left));
+
+  int height = std::max(0, container_size.height() - insets_.height());
+  int top = insets_.top();
+  if (height < min_size_.height() && insets_.height() > 0) {
+    int min_height = std::min(min_size_.height(), container_size.height());
+    int insets_height = container_size.height() - min_height;
+    int insets_decrease = insets_.height() - insets_height;
+    // Decrease both top and bottom insets proportionally.
+    top -= insets_decrease * insets_.top() / insets_.height();
+    height = min_height;
+  }
+  top = std::max(0, std::min(container_size.height(), top));
+
+  new_contents_bounds->SetRect(left, top, width, height);
+}