Always restore GL scissor box in GLRenderer::RestoreGLState()

cc/output/gl_renderer_unittest.cc

Index: cc/output/gl_renderer_unittest.cc
diff --git a/cc/output/gl_renderer_unittest.cc b/cc/output/gl_renderer_unittest.cc
index d9456b38a2dff99bc009d2de3a22e832ae144bb1..a2d28af49e03a85cd203d212eb0fe6ba26676618 100644
--- a/cc/output/gl_renderer_unittest.cc
+++ b/cc/output/gl_renderer_unittest.cc
@@ -1908,6 +1908,7 @@ class GLRendererPartialSwapTest : public GLRendererTest {
       EXPECT_CALL(*gl, Disable(GL_STENCIL_TEST)).InSequence(seq);
       EXPECT_CALL(*gl, Enable(GL_BLEND)).InSequence(seq);
       EXPECT_CALL(*gl, Disable(GL_SCISSOR_TEST)).InSequence(seq);
+      EXPECT_CALL(*gl, Scissor(0, 0, 0, 0)).InSequence(seq);
 
       // Partial frame, we should use a scissor to swap only that part when
       // partial swap is enabled.