cc: Split out calcDrawEtc from drawLayers

cc/layer_impl_unittest.cc

Index: cc/layer_impl_unittest.cc
diff --git a/cc/layer_impl_unittest.cc b/cc/layer_impl_unittest.cc
index bf8e96ec47cde094cab91ab6fc955b4497154736..36c082808e384c074513055ecbfae7988a6f7e41 100644
--- a/cc/layer_impl_unittest.cc
+++ b/cc/layer_impl_unittest.cc
@@ -7,6 +7,7 @@
 #include "cc/single_thread_proxy.h"
 #include "cc/test/fake_impl_proxy.h"
 #include "cc/test/fake_layer_tree_host_impl.h"
+#include "cc/thread.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/skia/include/effects/SkBlurImageFilter.h"
@@ -51,6 +52,18 @@ namespace {
     EXPECT_FALSE(grandChild->layerPropertyChanged());                   \
     EXPECT_TRUE(root->layerSurfacePropertyChanged())
 
+#define VERIFY_NEEDS_UPDATE_DRAW_PROPERTIES(codeToTest)                 \
+    root->resetAllChangeTrackingForSubtree();                           \
+    hostImpl.resetNeedsUpdateDrawProperties();                          \
+    codeToTest;                                                         \
+    EXPECT_TRUE(hostImpl.needsUpdateDrawProperties());
+
+#define VERIFY_NO_NEEDS_UPDATE_DRAW_PROPERTIES(codeToTest)              \
+    root->resetAllChangeTrackingForSubtree();                           \
+    hostImpl.resetNeedsUpdateDrawProperties();                          \
+    codeToTest;                                                         \
+    EXPECT_FALSE(hostImpl.needsUpdateDrawProperties());
+
 TEST(LayerImplTest, verifyLayerChangesAreTrackedProperly)
 {
     //