Refactor the Android port to allow access to the chrome layer.

chrome/browser/component/web_contents_delegate_android/web_contents_delegate_android.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_COMPONENT_WEB_CONTENTS_DELEGATE_ANDROID_WEB_CONTENTS_DELEGATE_ANDROID_H_
+#define CHROME_BROWSER_COMPONENT_WEB_CONTENTS_DELEGATE_ANDROID_WEB_CONTENTS_DELEGATE_ANDROID_H_
+
+#include "base/android/jni_helper.h"
+#include "base/android/scoped_java_ref.h"
+#include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
+#include "content/public/browser/native_web_keyboard_event.h"
+#include "content/public/browser/web_contents_delegate.h"
+#include "content/public/browser/web_contents_observer.h"
+#include "content/public/common/javascript_message_type.h"
+#include "content/public/common/referrer.h"
+#include "googleurl/src/gurl.h"
+#include "net/base/net_errors.h"
+
+namespace content {
+class DownloadItem;
+class JavaScriptDialogCreator;
+struct NativeWebKeyboardEvent;
+class RenderViewHost;
+class WebContents;
+class WebContentsObserver;
+}
+
+namespace web_contents_delegate_android {
+
+enum WebContentsDelegateLogLevel {
+  // Equivalent of WebCore::WebConsoleMessage::LevelTip.
+  WEB_CONTENTS_DELEGATE_LOG_LEVEL_TIP = 0,
+  // Equivalent of WebCore::WebConsoleMessage::LevelLog.
+  WEB_CONTENTS_DELEGATE_LOG_LEVEL_LOG = 1,
+  // Equivalent of WebCore::WebConsoleMessage::LevelWarning.
+  WEB_CONTENTS_DELEGATE_LOG_LEVEL_WARNING = 2,
+  // Equivalent of WebCore::WebConsoleMessage::LevelError.
+  WEB_CONTENTS_DELEGATE_LOG_LEVEL_ERROR = 3,
+};
+
+
+// Native underpinnings of WebContentsDelegateAndroid.java. Provides a default
+// delegate for WebContents to forward calls to the java peer. The embedding
+// application may subclass and override methods on either the C++ or Java side
+// as required.
+class WebContentsDelegateAndroid : public content::WebContentsDelegate {
+ public:
+  WebContentsDelegateAndroid(JNIEnv* env, jobject obj);
+  virtual ~WebContentsDelegateAndroid();
+
+  // Binds this WebContentsDelegateAndroid to the passed WebContents instance,
+  // such that when that WebContents is destroyed, this
+  // WebContentsDelegateAndroid instance will be destroyed too.
+  void SetOwnerWebContents(content::WebContents* contents);
+
+  // Overridden from WebContentsDelegate:
+  virtual content::WebContents* OpenURLFromTab(
+      content::WebContents* source,
+      const content::OpenURLParams& params) OVERRIDE;
+  virtual bool ShouldIgnoreNavigation(
+      content::WebContents* source,
+      const GURL& url,
+      const content::Referrer& referrer,
+      WindowOpenDisposition disposition,
+      content::PageTransition transition_type) OVERRIDE;
+  virtual void NavigationStateChanged(const content::WebContents* source,
+                                      unsigned changed_flags) OVERRIDE;
+  virtual void AddNewContents(content::WebContents* source,
+                              content::WebContents* new_contents,
+                              WindowOpenDisposition disposition,
+                              const gfx::Rect& initial_pos,
+                              bool user_gesture) OVERRIDE;
+  virtual void ActivateContents(content::WebContents* contents) OVERRIDE;
+  virtual void DeactivateContents(content::WebContents* contents) OVERRIDE;
+  virtual void LoadingStateChanged(content::WebContents* source) OVERRIDE;
+  virtual void LoadProgressChanged(content::WebContents* source,
+                                   double load_progress) OVERRIDE;
+  virtual void CloseContents(content::WebContents* source) OVERRIDE;
+  virtual void MoveContents(content::WebContents* source,
+                            const gfx::Rect& pos) OVERRIDE;
+  virtual bool AddMessageToConsole(content::WebContents* source,
+                                   int32 level,
+                                   const string16& message,
+                                   int32 line_no,
+                                   const string16& source_id) OVERRIDE;
+  // TODO(merge): WARNING! method no longer available on the base class.
+  // See http://b/issue?id=5862108
+  virtual void URLStarredChanged(content::WebContents* source, bool starred);
+  virtual void UpdateTargetURL(content::WebContents* source,
+                               int32 page_id,
+                               const GURL& url) OVERRIDE;
+  virtual bool CanDownload(content::RenderViewHost* source,
+                           int request_id,
+                           const std::string& request_method) OVERRIDE;
+  virtual void OnStartDownload(content::WebContents* source,
+                               content::DownloadItem* download) OVERRIDE;
+  virtual bool ShouldOverrideLoading(const GURL& url) OVERRIDE;
+  virtual void HandleKeyboardEvent(
+      content::WebContents* source,
+      const content::NativeWebKeyboardEvent& event) OVERRIDE;
+  virtual content::JavaScriptDialogCreator* GetJavaScriptDialogCreator()
+      OVERRIDE;
+  virtual bool TakeFocus(content::WebContents* source, bool reverse) OVERRIDE;
+
+  void SetJavaScriptDialogCreator(
+      content::JavaScriptDialogCreator* javascript_dialog_creator) {
+    javascript_dialog_creator_ = javascript_dialog_creator;
+  }
+
+ protected:
+  base::android::ScopedJavaLocalRef<jobject> GetJavaDelegate(JNIEnv* env) const;
+
+ private:
+  // We depend on the java side user of WebContentDelegateAndroid to hold a
+  // strong reference to that object as long as they want to receive callbacks
+  // on it. Using a weak ref here allows it to be correctly GCed.
+  JavaObjectWeakGlobalRef weak_java_delegate_;
+
+  // The object responsible for creating JavaScript dialogs.
+  content::JavaScriptDialogCreator* javascript_dialog_creator_;
+};
+
+bool RegisterWebContentsDelegateAndroid(JNIEnv* env);
+
+}  // namespace web_contents_delegate_android
+
+#endif  // CHROME_BROWSER_COMPONENT_WEB_CONTENTS_DELEGATE_ANDROID_WEB_CONTENTS_DELEGATE_ANDROID_H_