cc: Remove opaque flags from SharedQuadState and DrawQuad

cc/checkerboard_draw_quad.cc

Index: cc/checkerboard_draw_quad.cc
diff --git a/cc/checkerboard_draw_quad.cc b/cc/checkerboard_draw_quad.cc
index d12cd4b20429ca63daf2c0c57ffe052db9fd1c52..c8e30218d56bebff90c4b3db810b1c58713b514c 100644
--- a/cc/checkerboard_draw_quad.cc
+++ b/cc/checkerboard_draw_quad.cc
@@ -14,9 +14,11 @@ scoped_ptr<CheckerboardDrawQuad> CheckerboardDrawQuad::create(const SharedQuadSt
 }
 
 CheckerboardDrawQuad::CheckerboardDrawQuad(const SharedQuadState* sharedQuadState, const gfx::Rect& quadRect, SkColor color)
-    : DrawQuad(sharedQuadState, DrawQuad::CHECKERBOARD, quadRect)
+    : DrawQuad(sharedQuadState, DrawQuad::CHECKERBOARD, quadRect, quadRect)
     , m_color(color)
 {
+    if (SkColorGetA(m_color) < 255)
+        m_opaqueRect = gfx::Rect();
 }
 
 const CheckerboardDrawQuad* CheckerboardDrawQuad::materialCast(const DrawQuad* quad)