Initial pass at integrating Differ into the chromoting host code....

gfx/rect.cc

 // Copyright (c) 2010 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 "gfx/rect.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #elif defined(OS_MACOSX)
 #include <CoreGraphics/CGGeometry.h>
@@ skipping 99 matching lines @@
 }
 
 void Rect::Offset(int horizontal, int vertical) {
   origin_.Offset(horizontal, vertical);
 }
 
 bool Rect::operator==(const Rect& other) const {
   return origin_ == other.origin_ && size_ == other.size_;
 }
 
+bool Rect::operator<(const Rect& other) const {
+  if (origin_ == other.origin_) {
+    if (width() == other.width()) {
+      return height() < other.height();
+    } else {
+      return width() < other.width();
+    }
+  } else {
+    return origin_ < other.origin_;
+  }
+}
+
 #if defined(OS_WIN)
 RECT Rect::ToRECT() const {
   RECT r;
   r.left = x();
   r.right = right();
   r.top = y();
   r.bottom = bottom();
   return r;
 }
 #elif defined(OS_MACOSX)
@@ skipping 98 matching lines @@
              (x() == rect.right() || right() == rect.x())) ||
          (x() == rect.x() && width() == rect.width() &&
              (y() == rect.bottom() || bottom() == rect.y()));
 }
 
 }  // namespace gfx
 
 std::ostream& operator<<(std::ostream& out, const gfx::Rect& r) {
   return out << r.origin() << " " << r.size();
 }