Re-land: cc: Use worker context for one-copy tile initialization.

cc/trees/layer_tree_host_impl.cc

Index: cc/trees/layer_tree_host_impl.cc
diff --git a/cc/trees/layer_tree_host_impl.cc b/cc/trees/layer_tree_host_impl.cc
index 26c14925bf1d19c1c4f6e64d88e540e346f1f5ed..cb5cb997c0d05a36e73e39f16dc6d38940d848e1 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -152,11 +152,6 @@ size_t GetMaxTransferBufferUsageBytes(
                   max_transfer_buffer_usage_bytes);
 }
 
-size_t GetMaxStagingResourceCount() {
-  // Upper bound for number of staging resource to allow.
-  return 32;
-}
-
 size_t GetDefaultMemoryAllocationLimit() {
   // TODO(ccameron): (http://crbug.com/137094) This 64MB default is a straggler
   // from the old texture manager and is just to give us a default memory
@@ -1234,7 +1229,7 @@ void LayerTreeHostImpl::UpdateTileManagerMemoryPolicy(
       100);
 
   DCHECK(resource_pool_);
-  resource_pool_->CheckBusyResources(false);
+  resource_pool_->CheckBusyResources();
   // Soft limit is used for resource pool such that memory returns to soft
   // limit after going over.
   resource_pool_->SetResourceUsageLimits(
@@ -1242,15 +1237,6 @@ void LayerTreeHostImpl::UpdateTileManagerMemoryPolicy(
       unused_memory_limit_in_bytes,
       global_tile_state_.num_resources_limit);
 
-  // Release all staging resources when invisible.
-  if (staging_resource_pool_) {
-    staging_resource_pool_->CheckBusyResources(false);
-    staging_resource_pool_->SetResourceUsageLimits(
-        std::numeric_limits<size_t>::max(),
-        std::numeric_limits<size_t>::max(),
-        visible_ ? GetMaxStagingResourceCount() : 0);
-  }
-
   DidModifyTilePriorities();
 }
 
@@ -1309,9 +1295,11 @@ void LayerTreeHostImpl::NotifyReadyToDraw() {
 void LayerTreeHostImpl::NotifyAllTileTasksCompleted() {
   // The tile tasks started by the most recent call to PrepareTiles have
   // completed. Now is a good time to free resources if necessary.
-  if (output_surface_ && global_tile_state_.hard_memory_limit_in_bytes == 0) {
-    output_surface_->SetWorkerContextShouldAggressivelyFreeResources(
-        true /* aggressively_free_resources */);
+  if (global_tile_state_.hard_memory_limit_in_bytes == 0) {
+    if (output_surface_) {
+      output_surface_->SetWorkerContextShouldAggressivelyFreeResources(
+          true /* aggressively_free_resources */);
+    }
   }
 }
 
@@ -1464,7 +1452,7 @@ void LayerTreeHostImpl::ReclaimResources(const CompositorFrameAck* ack) {
   // In OOM, we now might be able to release more resources that were held
   // because they were exported.
   if (resource_pool_) {
-    resource_pool_->CheckBusyResources(false);
+    resource_pool_->CheckBusyResources();
     resource_pool_->ReduceResourceUsage();
   }
   // If we're not visible, we likely released resources, so we want to
@@ -2076,8 +2064,7 @@ void LayerTreeHostImpl::CreateAndSetRenderer() {
 }
 
 void LayerTreeHostImpl::CreateTileManagerResources() {
-  CreateResourceAndTileTaskWorkerPool(&tile_task_worker_pool_, &resource_pool_,
-                                      &staging_resource_pool_);
+  CreateResourceAndTileTaskWorkerPool(&tile_task_worker_pool_, &resource_pool_);
   // TODO(vmpstr): Initialize tile task limit at ctor time.
   tile_manager_->SetResources(
       resource_pool_.get(), tile_task_worker_pool_->AsTileTaskRunner(),
@@ -2088,8 +2075,7 @@ void LayerTreeHostImpl::CreateTileManagerResources() {
 
 void LayerTreeHostImpl::CreateResourceAndTileTaskWorkerPool(
     scoped_ptr<TileTaskWorkerPool>* tile_task_worker_pool,
-    scoped_ptr<ResourcePool>* resource_pool,
-    scoped_ptr<ResourcePool>* staging_resource_pool) {
+    scoped_ptr<ResourcePool>* resource_pool) {
   DCHECK(GetTaskRunner());
 
   // Pass the single-threaded synchronous task graph runner to the worker pool
@@ -2143,14 +2129,6 @@ void LayerTreeHostImpl::CreateResourceAndTileTaskWorkerPool(
   }
 
   if (settings_.use_one_copy) {
-    // Synchronous single-threaded mode depends on tiles being ready to
-    // draw when raster is complete.  Therefore, it must use one of zero
-    // copy, software raster, or GPU raster.
-    DCHECK(!is_synchronous_single_threaded_);
-
-    // We need to create a staging resource pool when using copy rasterizer.
-    *staging_resource_pool =
-        ResourcePool::Create(resource_provider_.get(), image_target);
     *resource_pool =
         ResourcePool::Create(resource_provider_.get(), GL_TEXTURE_2D);
 
@@ -2160,9 +2138,8 @@ void LayerTreeHostImpl::CreateResourceAndTileTaskWorkerPool(
 
     *tile_task_worker_pool = OneCopyTileTaskWorkerPool::Create(
         GetTaskRunner(), task_graph_runner, context_provider,
-        resource_provider_.get(), staging_resource_pool_.get(),
-        max_copy_texture_chromium_size,
-        settings_.use_persistent_map_for_gpu_memory_buffers);
+        resource_provider_.get(), max_copy_texture_chromium_size,
+        settings_.use_persistent_map_for_gpu_memory_buffers, image_target);
     return;
   }
 
@@ -2205,7 +2182,6 @@ void LayerTreeHostImpl::PostFrameTimingEvents(
 void LayerTreeHostImpl::CleanUpTileManager() {
   tile_manager_->FinishTasksAndCleanUp();
   resource_pool_ = nullptr;
-  staging_resource_pool_ = nullptr;
   tile_task_worker_pool_ = nullptr;
   single_thread_synchronous_task_graph_runner_ = nullptr;
 }
@@ -2238,8 +2214,7 @@ bool LayerTreeHostImpl::InitializeRenderer(
       proxy_->blocking_main_thread_task_runner(),
       settings_.renderer_settings.highp_threshold_min,
       settings_.renderer_settings.use_rgba_4444_textures,
-      settings_.renderer_settings.texture_id_allocation_chunk_size,
-      settings_.use_persistent_map_for_gpu_memory_buffers);
+      settings_.renderer_settings.texture_id_allocation_chunk_size);
 
   CreateAndSetRenderer();