Re-land alexbost's experimental offscreenTabs API.

chrome/browser/extensions/api/offscreen_tabs/offscreen_tabs_api.h

+// Copyright (c) 2012 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 CHROME_BROWSER_EXTENSIONS_API_OFFSCREEN_TABS_OFFSCREEN_TABS_API_H_
+#define CHROME_BROWSER_EXTENSIONS_API_OFFSCREEN_TABS_OFFSCREEN_TABS_API_H_
+#pragma once
+
+#include <string>
+
+#include "base/values.h"
+#include "chrome/browser/extensions/extension_function.h"
+#include "chrome/browser/extensions/extension_tabs_module.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
+#include "content/public/browser/web_contents_observer.h"
+
+// The offscreen tabs module depends on the tabs module so we can share
+// code between them. The long-term goal is to fold the offscreen tabs
+// functionality into the tabs API. While these methods seem very similar to
+// those in tabs, there are a few key differences that need to be resolved.
+//  - Offscreen tabs are invisible (maybe this could be a property on Tab).
+//  - The lifetime of an offscreen tab is tied to the parent tab that opened
+//    it. We do this to prevent leaking these tabs, since users wouldn't have
+//    a way of directly closing them or knowing they're open.
+//  - Offscreen tabs have a width and height, while regular tabs don't. This
+//    lets clients control the dimensions of the images in ToDataUrl.
+
+class BackingStore;
+class SkBitmap;
+class TabContentsWrapper;
+namespace content {
+class WebContents;
+}  // namespace content
+
+// Creates an offscreen tab.
+class CreateOffscreenTabFunction : public SyncExtensionFunction {
+ public:
+  CreateOffscreenTabFunction();
+ private:
+  virtual ~CreateOffscreenTabFunction();
+  virtual bool RunImpl() OVERRIDE;
+  DECLARE_EXTENSION_FUNCTION_NAME("experimental.offscreenTabs.create")
+  DISALLOW_COPY_AND_ASSIGN(CreateOffscreenTabFunction);
+};
+
+// Gets info about an offscreen tab.
+class GetOffscreenTabFunction : public SyncExtensionFunction {
+ public:
+  GetOffscreenTabFunction();
+ private:
+  virtual ~GetOffscreenTabFunction();
+  virtual bool RunImpl() OVERRIDE;
+  DECLARE_EXTENSION_FUNCTION_NAME("experimental.offscreenTabs.get")
+  DISALLOW_COPY_AND_ASSIGN(GetOffscreenTabFunction);
+};
+
+// Gets all offscreen tabs created by the tab that invoked this function.
+class GetAllOffscreenTabFunction : public SyncExtensionFunction {
+ public:
+  GetAllOffscreenTabFunction();
+ private:
+  virtual ~GetAllOffscreenTabFunction();
+  virtual bool RunImpl() OVERRIDE;
+  DECLARE_EXTENSION_FUNCTION_NAME("experimental.offscreenTabs.getAll")
+  DISALLOW_COPY_AND_ASSIGN(GetAllOffscreenTabFunction);
+};
+
+// Removes an offscreen tab.
+class RemoveOffscreenTabFunction : public SyncExtensionFunction {
+ public:
+  RemoveOffscreenTabFunction();
+ private:
+  virtual ~RemoveOffscreenTabFunction();
+  virtual bool RunImpl() OVERRIDE;
+  DECLARE_EXTENSION_FUNCTION_NAME("experimental.offscreenTabs.remove")
+  DISALLOW_COPY_AND_ASSIGN(RemoveOffscreenTabFunction);
+};
+
+// Synthesizes a keyboard event based on a passed-in JavaScript keyboard event.
+// TODO(jstritar): This would be useful on the chrome.tabs API.
+class SendKeyboardEventOffscreenTabFunction : public SyncExtensionFunction {
+ public:
+  SendKeyboardEventOffscreenTabFunction();
+ private:
+  virtual ~SendKeyboardEventOffscreenTabFunction();
+  virtual bool RunImpl() OVERRIDE;
+  DECLARE_EXTENSION_FUNCTION_NAME(
+    "experimental.offscreenTabs.sendKeyboardEvent")
+  DISALLOW_COPY_AND_ASSIGN(SendKeyboardEventOffscreenTabFunction);
+};
+
+// Synthesizes a mouse event based on a passed-in JavaScript mouse event.
+// Since only the application knows where the user clicks, x and y coordinates
+// need to be passed in as well in this case of click, mousedown, and mouseup.
+// TODO(jstritar): This would be useful on the chrome.tabs API.
+class SendMouseEventOffscreenTabFunction : public SyncExtensionFunction {
+ public:
+  SendMouseEventOffscreenTabFunction();
+ private:
+  virtual ~SendMouseEventOffscreenTabFunction();
+  virtual bool RunImpl() OVERRIDE;
+  DECLARE_EXTENSION_FUNCTION_NAME("experimental.offscreenTabs.sendMouseEvent")
+  DISALLOW_COPY_AND_ASSIGN(SendMouseEventOffscreenTabFunction);
+};
+
+// Gets a snapshot of the offscreen tab and returns it as a data URL.
+class ToDataUrlOffscreenTabFunction : public CaptureVisibleTabFunction {
+ public:
+  ToDataUrlOffscreenTabFunction();
+ private:
+  virtual ~ToDataUrlOffscreenTabFunction();
+  virtual bool GetTabToCapture(content::WebContents** web_contents,
+                               TabContentsWrapper** wrapper) OVERRIDE;
+  // TODO(jstritar): Rename to toDataUrl.
+  DECLARE_EXTENSION_FUNCTION_NAME("experimental.offscreenTabs.toDataUrl")
+  DISALLOW_COPY_AND_ASSIGN(ToDataUrlOffscreenTabFunction);
+};
+
+// Updates an offscreen tab.
+class UpdateOffscreenTabFunction : public UpdateTabFunction {
+ public:
+  UpdateOffscreenTabFunction();
+ private:
+  virtual ~UpdateOffscreenTabFunction();
+  virtual bool RunImpl() OVERRIDE;
+  virtual void PopulateResult() OVERRIDE;
+  DECLARE_EXTENSION_FUNCTION_NAME("experimental.offscreenTabs.update")
+  DISALLOW_COPY_AND_ASSIGN(UpdateOffscreenTabFunction);
+};
+
+#endif  // CHROME_BROWSER_EXTENSIONS_API_OFFSCREEN_TABS_OFFSCREEN_TABS_API_H_