cc: Support anti-aliasing for solid color layers.

cc/solid_color_draw_quad.cc

Index: cc/solid_color_draw_quad.cc
diff --git a/cc/solid_color_draw_quad.cc b/cc/solid_color_draw_quad.cc
index 54a9b75166f1587067c34f79dfe44edee047901a..6cb7a3313e91ee7d8a34c61c76e8e077c9c6bcae 100644
--- a/cc/solid_color_draw_quad.cc
+++ b/cc/solid_color_draw_quad.cc
@@ -8,7 +8,13 @@
 
 namespace cc {
 
-SolidColorDrawQuad::SolidColorDrawQuad() : color(0) {}
+SolidColorDrawQuad::SolidColorDrawQuad()
+    : color(0),
+      left_edge_aa(false),
+      top_edge_aa(false),
+      right_edge_aa(false),
+      bottom_edge_aa(false) {
+}
 
 scoped_ptr<SolidColorDrawQuad> SolidColorDrawQuad::Create() {
   return make_scoped_ptr(new SolidColorDrawQuad);
@@ -16,13 +22,24 @@ scoped_ptr<SolidColorDrawQuad> SolidColorDrawQuad::Create() {
 
 void SolidColorDrawQuad::SetNew(const SharedQuadState* shared_quad_state,
                                 gfx::Rect rect,
-                                SkColor color) {
+                                SkColor color,
+                                bool left_edge_aa,
+                                bool top_edge_aa,
+                                bool right_edge_aa,
+                                bool bottom_edge_aa) {
   gfx::Rect opaque_rect = SkColorGetA(color) == 255 ? rect : gfx::Rect();
   gfx::Rect visible_rect = rect;
   bool needs_blending = false;
   DrawQuad::SetAll(shared_quad_state, DrawQuad::SOLID_COLOR, rect, opaque_rect,
                    visible_rect, needs_blending);
   this->color = color;
+  this->left_edge_aa = left_edge_aa;
+  this->top_edge_aa = top_edge_aa;
+  this->right_edge_aa = right_edge_aa;
+  this->bottom_edge_aa = bottom_edge_aa;
+
+  // Override needs_blending after initializing the quad.
+  this->needs_blending = IsAntialiased();
 }
 
 void SolidColorDrawQuad::SetAll(const SharedQuadState* shared_quad_state,
@@ -30,10 +47,18 @@ void SolidColorDrawQuad::SetAll(const SharedQuadState* shared_quad_state,
                                 gfx::Rect opaque_rect,
                                 gfx::Rect visible_rect,
                                 bool needs_blending,
-                                SkColor color) {
+                                SkColor color,
+                                bool left_edge_aa,
+                                bool top_edge_aa,
+                                bool right_edge_aa,
+                                bool bottom_edge_aa) {
   DrawQuad::SetAll(shared_quad_state, DrawQuad::SOLID_COLOR, rect, opaque_rect,
                    visible_rect, needs_blending);
   this->color = color;
+  this->left_edge_aa = left_edge_aa;
+  this->top_edge_aa = top_edge_aa;
+  this->right_edge_aa = right_edge_aa;
+  this->bottom_edge_aa = bottom_edge_aa;
 }
 
 const SolidColorDrawQuad* SolidColorDrawQuad::MaterialCast(