Implement WebViewDatabase's hasFormData API for chromium based webview.

android_webview/browser/aw_form_database_service.h

+// Copyright (c) 2013 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_BROWSER_AW_FORM_DATABASE_SERVICE_H_
+#define ANDROID_WEBVIEW_BROWSER_AW_FORM_DATABASE_SERVICE_H_
+
+#include "base/basictypes.h"
+#include "base/files/file_path.h"
+#include "base/synchronization/waitable_event.h"
+#include "components/autofill/browser/webdata/autofill_webdata_service.h"
+#include "components/webdata/common/web_data_service_consumer.h"
+#include "components/webdata/common/web_database_service.h"
+
+namespace android_webview {
+
+// Handles the database operations necessary to implement the autocomplete
+// functionality. This includes creating and initializing the components that
+// handle the database backend, and providing a synchronous interface when
+// needed (the chromium database components have an async. interface).
+class AwFormDatabaseService : public WebDataServiceConsumer {
+ public:
+  AwFormDatabaseService(const base::FilePath path);
+
+  virtual ~AwFormDatabaseService();
+
+  // TODO(sgurun) Who will call this?
+  void Shutdown();
+
+  // Returns whether the form has any elements stored. May do

[benm (inactive), 2013/05/07 11:16:11]

do you mean whether the database has any elements stored?

[sgurun-gerrit only, 2013/05/07 18:39:02]

Done.

+  // IO access and block.
+  bool HasFormElements();

[benm (inactive), 2013/05/07 11:16:11]

Would HasFormData be a better name for symmetry with the Android API?

[sgurun-gerrit only, 2013/05/07 18:39:02]

I think we can use "data" in android_webview/ but components/ use elements when
referring to saved form data.

On 2013/05/07 11:16:11, benm wrote:

[benm (inactive), 2013/05/07 19:06:55]

That sounds good to me.

+
+  // Clear any saved form data. Executes asynchronously.
+  void ClearFormElements();

[benm (inactive), 2013/05/07 11:16:11]

ClearFormData?

[sgurun-gerrit only, 2013/05/07 18:39:02]

Done.

+
+  scoped_refptr<autofill::AutofillWebDataService>
+      get_autofill_webdata_service();
+
+  // WebDataServiceConsumer implementation.
+  virtual void OnWebDataServiceRequestDone(
+      WebDataServiceBase::Handle h,
+      const WDTypedResult* result) OVERRIDE;
+
+ private:
+  // Cancels the currently pending WebDataService query, if there is one.
+  void CancelPendingQuery();
+
+  void HasFormElementsImpl();
+
+  // Stores the query handle when an async database query is executed.
+  WebDataServiceBase::Handle pending_query_handle_;
+  bool has_form_elements_;
+  base::WaitableEvent completion_;
+
+  scoped_refptr<autofill::AutofillWebDataService> autofill_data_;
+  scoped_refptr<WebDatabaseService> web_database_;
+
+  DISALLOW_COPY_AND_ASSIGN(AwFormDatabaseService);
+};
+
+}  // namespace android_webview
+
+#endif  // ANDROID_WEBVIEW_BROWSER_AW_FORM_DATABASE_SERVICE_H_