Hardcode scrollbar rendering for Android

ui/gfx/vector2d_f.h

 // Copyright (c) 2012 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.
 
 // Defines a simple float vector class.  This class is used to indicate a
 // distance in two dimensions between two points. Subtracting two points should
 // produce a vector, and adding a vector to a point produces the point at the
 // vector's distance from the original point.
 
 #ifndef UI_GFX_VECTOR2D_F_H_
@@ skipping 52 matching lines @@
 
  private:
   float x_;
   float y_;
 };
 
 inline bool operator==(const Vector2dF& lhs, const Vector2dF& rhs) {
   return lhs.x() == rhs.x() && lhs.y() == rhs.y();
 }
 
+inline bool operator!=(const Vector2dF& lhs, const Vector2dF& rhs) {
+  return !(lhs == rhs);
+}
+
 inline Vector2dF operator-(const Vector2dF& v) {
   return Vector2dF(-v.x(), -v.y());
 }
 
 inline Vector2dF operator+(const Vector2dF& lhs, const Vector2dF& rhs) {
   Vector2dF result = lhs;
   result.Add(rhs);
   return result;
 }
 
@@ skipping 16 matching lines @@
                                   float y_scale);
 
 // Return a vector that is |v| scaled by the given scale factor.
 inline Vector2dF ScaleVector2d(const Vector2dF& v, float scale) {
   return ScaleVector2d(v, scale, scale);
 }
 
 }  // namespace gfx
 
 #endif // UI_GFX_VECTOR2D_F_H_