cc: Turn SharedQuadState into a struct-like class similar to DrawQuads.

cc/render_pass.cc

Index: cc/render_pass.cc
diff --git a/cc/render_pass.cc b/cc/render_pass.cc
index ac8dea49b14f62355a87681b87ab5a3dcce96e00..bbb36e5a629250d83100214c67e5b77c3f19b97c 100644
--- a/cc/render_pass.cc
+++ b/cc/render_pass.cc
@@ -90,10 +90,14 @@ void RenderPass::appendQuadsToFillScreen(LayerImpl* rootLayer, SkColor screenBac
     // Manually create the quad state for the gutter quads, as the root layer
     // doesn't have any bounds and so can't generate this itself.
     // FIXME: Make the gutter quads generated by the solid color layer (make it smarter about generating quads to fill unoccluded areas).
+
+    DCHECK(rootLayer->screenSpaceTransform().isInvertible());
+
     gfx::Rect rootTargetRect = rootLayer->renderSurface()->contentRect();
     float opacity = 1;
-    SharedQuadState* sharedQuadState = quadCuller.useSharedQuadState(SharedQuadState::create(rootLayer->drawTransform(), rootTargetRect, rootTargetRect, opacity));
-    DCHECK(rootLayer->screenSpaceTransform().isInvertible());
+    SharedQuadState* sharedQuadState = quadCuller.useSharedQuadState(SharedQuadState::Create());
+    sharedQuadState->SetAll(rootLayer->drawTransform(), rootTargetRect, rootTargetRect, opacity);
+
     WebTransformationMatrix transformToLayerSpace = rootLayer->screenSpaceTransform().inverse();
     for (Region::Iterator fillRects(fillRegion); fillRects.has_rect(); fillRects.next()) {
         // The root layer transform is composed of translations and scales only, no perspective, so mapping is sufficient.