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

cc/gl_renderer.cc

 // 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.
 
 #include "cc/gl_renderer.h"
 
 #include <set>
 #include <string>
 #include <vector>
 
@@ skipping 188 matching lines @@
 void GLRenderer::releaseRenderPassTextures()
 {
     m_renderPassTextures.clear();
 }
 
 void GLRenderer::viewportChanged()
 {
     m_isViewportChanged = true;
 }
 
-void GLRenderer::clearFramebuffer(DrawingFrame& frame)
+void GLRenderer::clearFramebuffer(DrawingFrame& frame, bool full)
 {
+    if (full) {
+        GLC(m_context, m_context->clearColor(0, 0, 0, 0));
+        GLC(m_context, m_context->disable(GL_SCISSOR_TEST));
+        GLC(m_context, m_context->clear(GL_COLOR_BUFFER_BIT));
+        GLC(m_context, m_context->enable(GL_SCISSOR_TEST));
+        return;
+    }
+
     // On DEBUG builds, opaque render passes are cleared to blue to easily see regions that were not drawn on the screen.
     if (frame.currentRenderPass->has_transparent_background)
         GLC(m_context, m_context->clearColor(0, 0, 0, 0));
     else
         GLC(m_context, m_context->clearColor(0, 0, 1, 1));
 
 #ifdef NDEBUG
     if (frame.currentRenderPass->has_transparent_background)
 #endif
         m_context->clear(GL_COLOR_BUFFER_BIT);
@@ skipping 1578 matching lines @@
 
     releaseRenderPassTextures();
 }
 
 bool GLRenderer::isContextLost()
 {
     return (m_context->getGraphicsResetStatusARB() != GL_NO_ERROR);
 }
 
 }  // namespace cc