Fixes a bug when the framebuffer is cleared with invalid scissor rect

cc/gl_renderer.h

 // Copyright 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.
 
 #ifndef CC_GL_RENDERER_H_
 #define CC_GL_RENDERER_H_
 
 #include "cc/cc_export.h"
 #include "cc/checkerboard_draw_quad.h"
 #include "cc/debug_border_draw_quad.h"
@@ skipping 60 matching lines @@
     const gfx::QuadF& sharedGeometryQuad() const { return m_sharedGeometryQuad; }
     const GeometryBinding* sharedGeometry() const { return m_sharedGeometry.get(); }
 
     bool getFramebufferTexture(ScopedResource*, const gfx::Rect& deviceRect);
     void releaseRenderPassTextures();
 
     virtual void bindFramebufferToOutputSurface(DrawingFrame&) OVERRIDE;
     virtual bool bindFramebufferToTexture(DrawingFrame&, const ScopedResource*, const gfx::Rect& framebufferRect) OVERRIDE;
     virtual void setDrawViewportSize(const gfx::Size&) OVERRIDE;
     virtual void setScissorTestRect(const gfx::Rect& scissorRect) OVERRIDE;
-    virtual void clearFramebuffer(DrawingFrame&) OVERRIDE;
+    virtual void clearFramebuffer(DrawingFrame&, bool) OVERRIDE;
     virtual void drawQuad(DrawingFrame&, const DrawQuad*) OVERRIDE;
     virtual void beginDrawingFrame(DrawingFrame&) OVERRIDE;
     virtual void finishDrawingFrame(DrawingFrame&) OVERRIDE;
     virtual bool flippedFramebuffer() const OVERRIDE;
     virtual void ensureScissorTestEnabled() OVERRIDE;
     virtual void ensureScissorTestDisabled() OVERRIDE;
     virtual void finishDrawingQuadList() OVERRIDE;
 
 private:
     static void toGLMatrix(float*, const gfx::Transform&);
@@ skipping 151 matching lines @@
 #if DEBUG_GL_CALLS && !defined(NDEBUG)
 #define GLC(context, x) (x, GLRenderer::debugGLCall(&*context, #x, __FILE__, __LINE__))
 #else
 #define GLC(context, x) (x)
 #endif
 
 
 }
 
 #endif  // CC_GL_RENDERER_H_