1 files changed, 61 insertions, 0 deletions
diff --git a/chromium/third_party/blink/renderer/platform/scheduler/main_thread/render_widget_signals.h b/chromium/third_party/blink/renderer/platform/scheduler/main_thread/render_widget_signals.h
new file mode 100644
index 00000000000..453e3b69468
--- /dev/null
+++ b/chromium/third_party/blink/renderer/platform/scheduler/main_thread/render_widget_signals.h
@@ -0,0 +1,61 @@
+// Copyright 2015 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.
+
+#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_SCHEDULER_MAIN_THREAD_RENDER_WIDGET_SIGNALS_H_
+#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_SCHEDULER_MAIN_THREAD_RENDER_WIDGET_SIGNALS_H_
+
+#include <memory>
+
+#include "base/trace_event/trace_event.h"
+#include "base/trace_event/trace_event_argument.h"
+#include "third_party/blink/renderer/platform/platform_export.h"
+
+namespace blink {
+namespace scheduler {
+
+class WebRenderWidgetSchedulingState;
+
+class PLATFORM_EXPORT RenderWidgetSignals {
+ public:
+  class PLATFORM_EXPORT Observer {
+   public:
+    virtual ~Observer() = default;
+
+    // If |hidden| is true then all render widgets managed by this renderer
+    // process have been hidden.
+    // If |hidden| is false at least one render widget managed by this renderer
+    // process has become visible and the renderer is no longer hidden.
+    // Will be called on the main thread.
+    virtual void SetAllRenderWidgetsHidden(bool hidden) = 0;
+
+    // Tells the observer whether or not we have at least one touch handler on
+    // a visible render widget. Will be called on the main thread.
+    virtual void SetHasVisibleRenderWidgetWithTouchHandler(
+        bool has_visible_render_widget_with_touch_handler) = 0;
+  };
+
+  explicit RenderWidgetSignals(Observer* observer);
+
+  std::unique_ptr<WebRenderWidgetSchedulingState>
+  NewRenderWidgetSchedulingState();
+
+  void AsValueInto(base::trace_event::TracedValue* state) const;
+
+ private:
+  friend class WebRenderWidgetSchedulingState;
+
+  void IncNumVisibleRenderWidgets();
+  void DecNumVisibleRenderWidgets();
+  void IncNumVisibleRenderWidgetsWithTouchHandlers();
+  void DecNumVisibleRenderWidgetsWithTouchHandlers();
+
+  Observer* observer_;  // NOT OWNED
+  int num_visible_render_widgets_;
+  int num_visible_render_widgets_with_touch_handlers_;
+};
+
+}  // namespace scheduler
+}  // namespace blink
+
+#endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_SCHEDULER_MAIN_THREAD_RENDER_WIDGET_SIGNALS_H_