cc: Support anti-aliasing for solid color layers.

cc/solid_color_layer_impl.cc

Index: cc/solid_color_layer_impl.cc
diff --git a/cc/solid_color_layer_impl.cc b/cc/solid_color_layer_impl.cc
index 1d5ed516fdbc52946389423d46a1eb75d9121085..70b7b3ea2ff0eb0b42c8073fe8d0f6ffcc44da57 100644
--- a/cc/solid_color_layer_impl.cc
+++ b/cc/solid_color_layer_impl.cc
@@ -4,8 +4,10 @@
 
 #include "cc/solid_color_layer_impl.h"
 
+#include "cc/math_util.h"
 #include "cc/quad_sink.h"
 #include "cc/solid_color_draw_quad.h"
+#include "ui/gfx/quad_f.h"
 
 namespace cc {
 
@@ -31,8 +33,19 @@ void SolidColorLayerImpl::appendQuads(QuadSink& quadSink, AppendQuadsData& appen
     for (int x = 0; x < width; x += m_tileSize) {
         for (int y = 0; y < height; y += m_tileSize) {
             gfx::Rect solidTileRect(x, y, std::min(width - x, m_tileSize), std::min(height - y, m_tileSize));
+
+            bool clipped = false;
+            gfx::QuadF visibleContentInTargetQuad = MathUtil::mapQuad(drawTransform(), gfx::QuadF(visibleContentRect()), clipped);
+            bool isAxisAlignedInTarget = !clipped && visibleContentInTargetQuad.IsRectilinear();
+            bool useAA = !isAxisAlignedInTarget;
+
+            bool leftEdgeAA = !x && useAA;
+            bool topEdgeAA = !y && useAA;
+            bool rightEdgeAA = x >= width - m_tileSize && useAA;
+            bool bottomEdgeAA = y >= height - m_tileSize && useAA;
+
             scoped_ptr<SolidColorDrawQuad> quad = SolidColorDrawQuad::Create();
-            quad->SetNew(sharedQuadState, solidTileRect, backgroundColor());
+            quad->SetNew(sharedQuadState, solidTileRect, DrawQuad::AntiAliasing(leftEdgeAA, topEdgeAA, rightEdgeAA, bottomEdgeAA), backgroundColor());
             quadSink.append(quad.PassAs<DrawQuad>(), appendQuadsData);
         }
     }