Fix uninitialized var in DirectRenderer

cc/output/direct_renderer.h

 // Copyright 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.
 
 #ifndef CC_OUTPUT_DIRECT_RENDERER_H_
 #define CC_OUTPUT_DIRECT_RENDERER_H_
 
 #include <memory>
 #include <unordered_map>
 
@@ skipping 176 matching lines @@
   bool use_partial_swap_;
 
   // TODO(danakj): Just use a vector of pairs here? Hash map is way overkill.
   std::unordered_map<RenderPassId,
                      std::unique_ptr<ScopedResource>,
                      RenderPassIdHash>
       render_pass_textures_;
   std::unordered_map<RenderPassId, TileDrawQuad, RenderPassIdHash>
       render_pass_bypass_quads_;
 
-  bool visible_;
+  bool visible_ = false;
 
   // For use in coordinate conversion, this stores the output rect, viewport
   // rect (= unflipped version of glViewport rect), the size of target
   // framebuffer, and the current window space viewport. During a draw, this
   // stores the values for the current render pass; in between draws, they
   // retain the values for the root render pass of the last draw.
   gfx::Rect current_draw_rect_;
   gfx::Rect current_viewport_rect_;
   gfx::Size current_surface_size_;
   gfx::Rect current_window_space_viewport_;
 
  private:
   bool initialized_ = false;
   gfx::Size enlarge_pass_texture_amount_;
 
   DISALLOW_COPY_AND_ASSIGN(DirectRenderer);
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_DIRECT_RENDERER_H_