Implement WebViewDatabase's hasFormData API for chromium based webview.

android_webview/browser/aw_form_database_service.h

Index: android_webview/browser/aw_form_database_service.h
diff --git a/android_webview/browser/aw_form_database_service.h b/android_webview/browser/aw_form_database_service.h
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+// 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();
+
+  void Shutdown();
+
+  // Returns whether the database has any data stored. May do
+  // IO access and block.
+  bool HasFormData();
+
+  // Clear any saved form data. Executes asynchronously.
+  void ClearFormData();
+
+  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 HasFormDataImpl();
+
+  // Stores the query handle when an async database query is executed.
+  WebDataServiceBase::Handle pending_query_handle_;
+  bool has_form_data_;
+  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_