Use custom ListContainer to allocate DrawQuads

cc/trees/layer_tree_host_unittest_delegated.cc

Index: cc/trees/layer_tree_host_unittest_delegated.cc
diff --git a/cc/trees/layer_tree_host_unittest_delegated.cc b/cc/trees/layer_tree_host_unittest_delegated.cc
index eaf78d49f997160f1b639c8602cb8934eca33404..e20fbbbe872a718766ece89252213a65c17750ed 100644
--- a/cc/trees/layer_tree_host_unittest_delegated.cc
+++ b/cc/trees/layer_tree_host_unittest_delegated.cc
@@ -767,11 +767,12 @@ class LayerTreeHostDelegatedTestRemapResourcesInQuads
     EXPECT_NE(parent_resource_id2, 555u);
 
     // The resources in the quads should be remapped to the parent's namespace.
-    const TextureDrawQuad* quad1 = TextureDrawQuad::MaterialCast(
-        delegated_impl->RenderPassesInDrawOrder()[0]->quad_list[0]);
+    QuadList::ConstIterator iter =
+        delegated_impl->RenderPassesInDrawOrder()[0]->quad_list.begin();
+    const TextureDrawQuad* quad1 = TextureDrawQuad::MaterialCast(&*iter);
     EXPECT_EQ(parent_resource_id1, quad1->resource_id);
-    const TextureDrawQuad* quad2 = TextureDrawQuad::MaterialCast(
-        delegated_impl->RenderPassesInDrawOrder()[0]->quad_list[1]);
+    ++iter;
+    const TextureDrawQuad* quad2 = TextureDrawQuad::MaterialCast(&*iter);
     EXPECT_EQ(parent_resource_id2, quad2->resource_id);
 
     EndTest();
@@ -1020,8 +1021,8 @@ class LayerTreeHostDelegatedTestFrameBeforeAck
 
     const RenderPass* pass = delegated_impl->RenderPassesInDrawOrder()[0];
     EXPECT_EQ(1u, pass->quad_list.size());
-    const TextureDrawQuad* quad = TextureDrawQuad::MaterialCast(
-        pass->quad_list[0]);
+    const TextureDrawQuad* quad =
+        TextureDrawQuad::MaterialCast(pass->quad_list.front());
     EXPECT_EQ(map.find(999)->second, quad->resource_id);
 
     EndTest();
@@ -1135,14 +1136,14 @@ class LayerTreeHostDelegatedTestFrameBeforeTakeResources
 
     const RenderPass* pass = delegated_impl->RenderPassesInDrawOrder()[0];
     EXPECT_EQ(3u, pass->quad_list.size());
-    const TextureDrawQuad* quad1 = TextureDrawQuad::MaterialCast(
-        pass->quad_list[0]);
+    QuadList::ConstIterator iter = pass->quad_list.begin();
+    const TextureDrawQuad* quad1 = TextureDrawQuad::MaterialCast(&*iter);
     EXPECT_EQ(map.find(999)->second, quad1->resource_id);
-    const TextureDrawQuad* quad2 = TextureDrawQuad::MaterialCast(
-        pass->quad_list[1]);
+    ++iter;
+    const TextureDrawQuad* quad2 = TextureDrawQuad::MaterialCast(&*iter);
     EXPECT_EQ(map.find(555)->second, quad2->resource_id);
-    const TextureDrawQuad* quad3 = TextureDrawQuad::MaterialCast(
-        pass->quad_list[2]);
+    ++iter;
+    const TextureDrawQuad* quad3 = TextureDrawQuad::MaterialCast(&*iter);
     EXPECT_EQ(map.find(444)->second, quad3->resource_id);
   }
 
@@ -1258,11 +1259,11 @@ class LayerTreeHostDelegatedTestBadFrame
 
         const RenderPass* pass = delegated_impl->RenderPassesInDrawOrder()[0];
         EXPECT_EQ(2u, pass->quad_list.size());
-        const TextureDrawQuad* quad1 = TextureDrawQuad::MaterialCast(
-            pass->quad_list[0]);
+        QuadList::ConstIterator iter = pass->quad_list.begin();
+        const TextureDrawQuad* quad1 = TextureDrawQuad::MaterialCast(&*iter);
         EXPECT_EQ(map.find(999)->second, quad1->resource_id);
-        const TextureDrawQuad* quad2 = TextureDrawQuad::MaterialCast(
-            pass->quad_list[1]);
+        ++iter;
+        const TextureDrawQuad* quad2 = TextureDrawQuad::MaterialCast(&*iter);
         EXPECT_EQ(map.find(555)->second, quad2->resource_id);
         break;
       }
@@ -1280,11 +1281,11 @@ class LayerTreeHostDelegatedTestBadFrame
         // 555 in it.
         const RenderPass* pass = delegated_impl->RenderPassesInDrawOrder()[0];
         EXPECT_EQ(2u, pass->quad_list.size());
-        const TextureDrawQuad* quad1 = TextureDrawQuad::MaterialCast(
-            pass->quad_list[0]);
+        QuadList::ConstIterator iter = pass->quad_list.begin();
+        const TextureDrawQuad* quad1 = TextureDrawQuad::MaterialCast(&*iter);
         EXPECT_EQ(map.find(999)->second, quad1->resource_id);
-        const TextureDrawQuad* quad2 = TextureDrawQuad::MaterialCast(
-            pass->quad_list[1]);
+        ++iter;
+        const TextureDrawQuad* quad2 = TextureDrawQuad::MaterialCast(&*iter);
         EXPECT_EQ(map.find(555)->second, quad2->resource_id);
         break;
       }
@@ -1298,8 +1299,8 @@ class LayerTreeHostDelegatedTestBadFrame
 
         const RenderPass* pass = delegated_impl->RenderPassesInDrawOrder()[0];
         EXPECT_EQ(1u, pass->quad_list.size());
-        const TextureDrawQuad* quad1 = TextureDrawQuad::MaterialCast(
-            pass->quad_list[0]);
+        const TextureDrawQuad* quad1 =
+            TextureDrawQuad::MaterialCast(pass->quad_list.front());
         EXPECT_EQ(map.find(999)->second, quad1->resource_id);
         break;
       }