Add 'preserve trailing view size' capability into the SingleSplitView....

views/controls/single_split_view.h

Index: views/controls/single_split_view.h
===================================================================
--- views/controls/single_split_view.h	(revision 20254)
+++ views/controls/single_split_view.h	(working copy)
@@ -20,6 +20,9 @@
 
   SingleSplitView(View* leading, View* trailing, Orientation orientation);
 
+  virtual void DidChangeBounds(const gfx::Rect& previous,
+                               const gfx::Rect& current);
+
   virtual void Layout();
 
   // SingleSplitView's preferred size is the sum of the preferred widths
@@ -36,6 +39,13 @@
   }
   int divider_offset() { return divider_offset_; }
 
+  // Sets whether the leading component is resized when the split views size
+  // changes. The default is true. A value of false results in the trailing
+  // component resizing on a bounds change.
+  void set_resize_leading_on_bounds_change(bool resize) {
+    resize_leading_on_bounds_change_ = resize;
+  }
+
  protected:
   virtual bool OnMousePressed(const MouseEvent& event);
   virtual bool OnMouseDragged(const MouseEvent& event);
@@ -70,6 +80,8 @@
   // Position of the divider.
   int divider_offset_;
 
+  bool resize_leading_on_bounds_change_;
+
   DISALLOW_COPY_AND_ASSIGN(SingleSplitView);
 };