cc/blimp: Add a LayerTreeHostRemote implementation.

cc/trees/layer_tree_host_in_process.cc

Index: cc/trees/layer_tree_host_in_process.cc
diff --git a/cc/trees/layer_tree_host_in_process.cc b/cc/trees/layer_tree_host_in_process.cc
index bed4665c9ed2282c6595f6ef4dca4f2d6a0e3ae2..0b10653e13b38a481af4c62b8586d798fc68142b 100644
--- a/cc/trees/layer_tree_host_in_process.cc
+++ b/cc/trees/layer_tree_host_in_process.cc
@@ -13,7 +13,6 @@
 #include <string>
 #include <unordered_map>
 
-#include "base/atomic_sequence_num.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/location.h"
@@ -64,10 +63,6 @@
 #include "ui/gfx/geometry/size_conversions.h"
 #include "ui/gfx/geometry/vector2d_conversions.h"
 
-namespace {
-static base::StaticAtomicSequenceNumber s_layer_tree_host_sequence_number;
-}
-
 namespace cc {
 namespace {
 
@@ -226,7 +221,7 @@ LayerTreeHostInProcess::LayerTreeHostInProcess(
       content_is_suitable_for_gpu_rasterization_(true),
       gpu_rasterization_histogram_recorded_(false),
       did_complete_scale_animation_(false),
-      id_(s_layer_tree_host_sequence_number.GetNext() + 1),
+      id_(LayerTreeHost::GenerateHostId()),
       next_commit_forces_redraw_(false),
       shared_bitmap_manager_(params->shared_bitmap_manager),
       gpu_memory_buffer_manager_(params->gpu_memory_buffer_manager),