PictureLayerImplTests: Start frame time ticks at 1 millisecond.

cc/layers/picture_layer_impl_unittest.cc

Index: cc/layers/picture_layer_impl_unittest.cc
diff --git a/cc/layers/picture_layer_impl_unittest.cc b/cc/layers/picture_layer_impl_unittest.cc
index 79da519ae097b24c3a35a44551a2b5925a5ef30e..26cae9c0bef3d0a37c1c67880aa9a14f17b2d9f6 100644
--- a/cc/layers/picture_layer_impl_unittest.cc
+++ b/cc/layers/picture_layer_impl_unittest.cc
@@ -406,6 +406,7 @@ TEST_F(PictureLayerImplTest, ExternalViewportRectForPrioritizingTiles) {
 
 TEST_F(PictureLayerImplTest, InvalidViewportForPrioritizingTiles) {
   base::TimeTicks time_ticks;
+  time_ticks += base::TimeDelta::FromMilliseconds(1);
   host_impl_.SetCurrentFrameTimeTicks(time_ticks);
 
   gfx::Size tile_size(100, 100);
@@ -494,6 +495,7 @@ TEST_F(PictureLayerImplTest, InvalidViewportForPrioritizingTiles) {
 
 TEST_F(PictureLayerImplTest, InvalidViewportAfterReleaseResources) {
   base::TimeTicks time_ticks;
+  time_ticks += base::TimeDelta::FromMilliseconds(1);
   host_impl_.SetCurrentFrameTimeTicks(time_ticks);
 
   gfx::Size tile_size(100, 100);
@@ -2674,6 +2676,7 @@ TEST_F(NoLowResPictureLayerImplTest, NothingRequiredIfActiveMissingTiles) {
 
 TEST_F(NoLowResPictureLayerImplTest, InvalidViewportForPrioritizingTiles) {
   base::TimeTicks time_ticks;
+  time_ticks += base::TimeDelta::FromMilliseconds(1);
   host_impl_.SetCurrentFrameTimeTicks(time_ticks);
 
   gfx::Size tile_size(100, 100);
@@ -2762,6 +2765,7 @@ TEST_F(NoLowResPictureLayerImplTest, InvalidViewportForPrioritizingTiles) {
 
 TEST_F(NoLowResPictureLayerImplTest, InvalidViewportAfterReleaseResources) {
   base::TimeTicks time_ticks;
+  time_ticks += base::TimeDelta::FromMilliseconds(1);
   host_impl_.SetCurrentFrameTimeTicks(time_ticks);
 
   gfx::Size tile_size(100, 100);