Implement renderer importance API for WebView

android_webview/native/aw_renderer_priority_manager.h

Index: android_webview/native/aw_renderer_priority_manager.h
diff --git a/android_webview/native/aw_renderer_priority_manager.h b/android_webview/native/aw_renderer_priority_manager.h
new file mode 100644
index 0000000000000000000000000000000000000000..dec22415fe1252eef9246a882c1fe9df2eeac1c7
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+++ b/android_webview/native/aw_renderer_priority_manager.h
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+// Copyright 2017 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 ANDROID_WEBVIEW_NATIVE_AW_RENDERER_PRIORITY_USER_DATA_H_
+#define ANDROID_WEBVIEW_NATIVE_AW_RENDERER_PRIORITY_USER_DATA_H_
+
+#include "base/supports_user_data.h"
+
+namespace content {
+class RenderProcessHost;
+}
+
+namespace android_webview {
+
+class AwRendererPriorityManager : public base::SupportsUserData::Data {
+ public:
+  // GENERATED_JAVA_ENUM_PACKAGE: org.chromium.android_webview.renderer_priority
+  enum RendererPriority {
+    RENDERER_PRIORITY_INITIAL = -1,
+    RENDERER_PRIORITY_WAIVED = 0,
+    RENDERER_PRIORITY_LOW = 1,
+    RENDERER_PRIORITY_HIGH = 2
+  };
+
+  explicit AwRendererPriorityManager(content::RenderProcessHost* host);
+
+  RendererPriority GetRendererPriority() const { return renderer_priority_; }
+  void SetRendererPriority(RendererPriority renderer_priority);
+
+ private:
+  static void SetRendererPriorityOnLauncherThread(
+      int pid,
+      RendererPriority renderer_priority);
+
+  content::RenderProcessHost* host_;
+  RendererPriority renderer_priority_;
+};
+
+}  // namespace android_webview
+
+#endif  //  ANDROID_WEBVIEW_NATIVE_AW_RENDERER_PRIORITY_USER_DATA_H_