cc: Reduce command buffer flushes related to creating texture ids.

cc/trees/layer_tree_host_unittest.cc

Index: cc/trees/layer_tree_host_unittest.cc
diff --git a/cc/trees/layer_tree_host_unittest.cc b/cc/trees/layer_tree_host_unittest.cc
index 13467cbb32dca05a33891d239a96ce973a7aa52e..b0273a01f6d93826d2be1dd83a1da280661ce026 100644
--- a/cc/trees/layer_tree_host_unittest.cc
+++ b/cc/trees/layer_tree_host_unittest.cc
@@ -1441,6 +1441,7 @@ MULTI_THREAD_TEST_F(LayerTreeHostTestDeviceScaleFactorScalesViewportAndLayers);
 class LayerTreeHostTestDirectRendererAtomicCommit : public LayerTreeHostTest {
  public:
   virtual void InitializeSettings(LayerTreeSettings* settings) OVERRIDE {
+    settings->texture_id_allocation_chunk_size = 1;
     // Make sure partial texture updates are turned off.
     settings->max_partial_texture_updates = 0;
     // Linear fade animator prevents scrollbars from drawing immediately.
@@ -1619,6 +1620,7 @@ class LayerTreeHostTestAtomicCommitWithPartialUpdate
     : public LayerTreeHostTest {
  public:
   virtual void InitializeSettings(LayerTreeSettings* settings) OVERRIDE {
+    settings->texture_id_allocation_chunk_size = 1;
     // Allow one partial texture update.
     settings->max_partial_texture_updates = 1;
     // No partial updates when impl side painting is enabled.
@@ -3751,6 +3753,10 @@ class LayerTreeHostTestUIResource : public LayerTreeHostTest {
  public:
   LayerTreeHostTestUIResource() : num_ui_resources_(0), num_commits_(0) {}
 
+  virtual void InitializeSettings(LayerTreeSettings* settings) OVERRIDE {
+    settings->texture_id_allocation_chunk_size = 1;
+  }
+
   virtual void BeginTest() OVERRIDE { PostSetNeedsCommitToMainThread(); }
 
   virtual void DidCommit() OVERRIDE {