Coverity: Initialize member variables.

ui/gfx/compositor/layer_animation_element.cc

 // Copyright (c) 2011 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 "ui/gfx/compositor/layer_animation_element.h"
 
 #include "base/compiler_specific.h"
 #include "ui/base/animation/tween.h"
 #include "ui/gfx/compositor/layer_animation_delegate.h"
 
@@ skipping 95 matching lines @@
   gfx::Rect start_;
   const gfx::Rect target_;
 
   DISALLOW_COPY_AND_ASSIGN(BoundsTransition);
 };
 
 class OpacityTransition : public LayerAnimationElement {
  public:
   OpacityTransition(float target, base::TimeDelta duration)
       : LayerAnimationElement(GetProperties(), duration),
+        start_(0.0f),
         target_(target) {
   }
   virtual ~OpacityTransition() {}
 
  protected:
   virtual void OnStart(LayerAnimationDelegate* delegate) OVERRIDE {
     start_ = delegate->GetOpacityForAnimation();
   }
 
   virtual void OnProgress(double t, LayerAnimationDelegate* delegate) OVERRIDE {
@@ skipping 84 matching lines @@
   return new OpacityTransition(opacity, duration);
 }
 
 // static
 LayerAnimationElement* LayerAnimationElement::CreatePauseElement(
     const AnimatableProperties& properties, base::TimeDelta duration) {
   return new Pause(properties, duration);
 }
 
 }  // namespace ui