Revert of cc: Adding BeginFrameTracker object and removing Now() from LTHI.

cc/trees/layer_tree_host_unittest_context.cc

Index: cc/trees/layer_tree_host_unittest_context.cc
diff --git a/cc/trees/layer_tree_host_unittest_context.cc b/cc/trees/layer_tree_host_unittest_context.cc
index fbac911c8e6e96a6456e2f54ae00e2bc522faca1..c1436e5368208f84ce8d2c4e69e52d5ba085c3b7 100644
--- a/cc/trees/layer_tree_host_unittest_context.cc
+++ b/cc/trees/layer_tree_host_unittest_context.cc
@@ -393,8 +393,8 @@
   }
 
   void BeginTest() override {
-    layer_tree_host()->Composite(base::TimeTicks::FromInternalValue(1));
-    layer_tree_host()->Composite(base::TimeTicks::FromInternalValue(2));
+    layer_tree_host()->Composite(base::TimeTicks());
+    layer_tree_host()->Composite(base::TimeTicks());
   }
 
   scoped_ptr<OutputSurface> CreateOutputSurface() override {
@@ -439,12 +439,12 @@
 
   void BeginTest() override {
     // First composite tries to create a surface.
-    layer_tree_host()->Composite(base::TimeTicks::FromInternalValue(1));
+    layer_tree_host()->Composite(base::TimeTicks());
     EXPECT_EQ(num_requests_, 2);
     EXPECT_TRUE(has_failed_);
 
     // Second composite should not request or fail.
-    layer_tree_host()->Composite(base::TimeTicks::FromInternalValue(2));
+    layer_tree_host()->Composite(base::TimeTicks());
     EXPECT_EQ(num_requests_, 2);
     EndTest();
   }
@@ -489,9 +489,7 @@
         LayerTreeHostContextTest::CreateOutputSurface());
   }
 
-  void BeginTest() override {
-    layer_tree_host()->Composite(base::TimeTicks::FromInternalValue(1));
-  }
+  void BeginTest() override { layer_tree_host()->Composite(base::TimeTicks()); }
 
   void ScheduleComposite() override {
     if (creating_output_)
@@ -524,7 +522,7 @@
 
   void BeginTest() override {
     in_composite_ = true;
-    layer_tree_host()->Composite(base::TimeTicks::FromInternalValue(1));
+    layer_tree_host()->Composite(base::TimeTicks());
     in_composite_ = false;
   }