android webview: allow cc to fail hardware draw

cc/scheduler/scheduler_state_machine.cc

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/scheduler/scheduler_state_machine.h"
 
 #include "base/format_macros.h"
 #include "base/logging.h"
 #include "base/strings/stringprintf.h"
 #include "base/trace_event/trace_event.h"
@@ skipping 22 matching lines @@
       prepare_tiles_funnel_(0),
       consecutive_checkerboard_animations_(0),
       max_pending_swaps_(1),
       pending_swaps_(0),
       swaps_with_current_output_surface_(0),
       needs_redraw_(false),
       needs_animate_(false),
       needs_prepare_tiles_(false),
       needs_begin_main_frame_(false),
       visible_(false),
+      resourceless_draw_(false),
       can_draw_(false),
       has_pending_tree_(false),
       pending_tree_is_ready_for_activation_(false),
       active_tree_needs_first_draw_(false),
       did_create_and_initialize_first_output_surface_(false),
       impl_latency_takes_priority_(false),
       main_thread_missed_last_deadline_(false),
       skip_next_begin_main_frame_to_reduce_latency_(false),
       children_need_begin_frames_(false),
       defer_commits_(false),
@@ skipping 165 matching lines @@
   state->SetInteger("max_pending_swaps_", max_pending_swaps_);
   state->SetInteger("pending_swaps_", pending_swaps_);
   state->SetInteger("swaps_with_current_output_surface",
                     swaps_with_current_output_surface_);
   state->SetBoolean("needs_redraw", needs_redraw_);
   state->SetBoolean("needs_animate_", needs_animate_);
   state->SetBoolean("needs_prepare_tiles", needs_prepare_tiles_);
   state->SetBoolean("needs_begin_main_frame", needs_begin_main_frame_);
   state->SetBoolean("visible", visible_);
   state->SetBoolean("can_draw", can_draw_);
+  state->SetBoolean("resourceless_draw", resourceless_draw_);
   state->SetBoolean("has_pending_tree", has_pending_tree_);
   state->SetBoolean("pending_tree_is_ready_for_activation",
                     pending_tree_is_ready_for_activation_);
   state->SetBoolean("active_tree_needs_first_draw",
                     active_tree_needs_first_draw_);
   state->SetBoolean("wait_for_ready_to_draw", wait_for_ready_to_draw_);
   state->SetBoolean("did_create_and_initialize_first_output_surface",
                     did_create_and_initialize_first_output_surface_);
   state->SetBoolean("impl_latency_takes_priority",
                     impl_latency_takes_priority_);
@@ skipping 11 matching lines @@
                     did_perform_swap_in_last_draw_);
   state->EndDictionary();
 }
 
 bool SchedulerStateMachine::PendingDrawsShouldBeAborted() const {
   // Normally when |visible_| is false, pending activations will be forced and
   // draws will be aborted. However, when the embedder is Android WebView,
   // software draws could be scheduled by the Android OS at any time and draws
   // should not be aborted in this case.
   bool is_output_surface_lost = (output_surface_state_ == OUTPUT_SURFACE_NONE);
-  if (settings_.using_synchronous_renderer_compositor)
+  if (resourceless_draw_)
     return is_output_surface_lost || !can_draw_;
 
   // These are all the cases where we normally cannot or do not want to draw
   // but, if needs_redraw_ is true and we do not draw to make forward progress,
   // we might deadlock with the main thread.
   // This should be a superset of PendingActivationsShouldBeForced() since
   // activation of the pending tree is blocked by drawing of the active tree and
   // the main thread might be blocked on activation of the most recent commit.
   return is_output_surface_lost || !can_draw_ || !visible_;
 }
@@ skipping 652 matching lines @@
   visible_ = visible;
 
   if (visible)
     main_thread_missed_last_deadline_ = false;
 
   // TODO(sunnyps): Change the funnel to a bool to avoid hacks like this.
   prepare_tiles_funnel_ = 0;
   wait_for_ready_to_draw_ = false;
 }
 
+void SchedulerStateMachine::SetResourcelessSoftareDraw(bool resourceless_draw) {
+  resourceless_draw_ = resourceless_draw;
+}
+
 void SchedulerStateMachine::SetCanDraw(bool can_draw) { can_draw_ = can_draw; }
 
 void SchedulerStateMachine::SetNeedsRedraw() { needs_redraw_ = true; }
 
 void SchedulerStateMachine::SetNeedsAnimate() {
   needs_animate_ = true;
 }
 
 bool SchedulerStateMachine::OnlyImplSideUpdatesExpected() const {
   bool has_impl_updates = needs_redraw_ || needs_animate_;
@@ skipping 161 matching lines @@
     case OUTPUT_SURFACE_ACTIVE:
     case OUTPUT_SURFACE_WAITING_FOR_FIRST_COMMIT:
     case OUTPUT_SURFACE_WAITING_FOR_FIRST_ACTIVATION:
       return true;
   }
   NOTREACHED();
   return false;
 }
 
 }  // namespace cc