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

cc/gl_renderer.cc

Index: cc/gl_renderer.cc
diff --git a/cc/gl_renderer.cc b/cc/gl_renderer.cc
index de6cfc169e3ee1571ba0c8f3119cc7d3354b15fa..38da039f7456e37dea04e8779622bca75996cb37 100644
--- a/cc/gl_renderer.cc
+++ b/cc/gl_renderer.cc
@@ -206,8 +206,16 @@ 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));