[Android] Upstream Modal Dialogs functionality

chrome/android/java/src/org/chromium/chrome/browser/JsResultHandler.java

Index: chrome/android/java/src/org/chromium/chrome/browser/JsResultHandler.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/JsResultHandler.java b/chrome/android/java/src/org/chromium/chrome/browser/JsResultHandler.java
new file mode 100644
index 0000000000000000000000000000000000000000..09bef6b05e177cb049fd7da431ea4a9820c56be5
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/JsResultHandler.java
@@ -0,0 +1,69 @@
+// 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.
+
+package org.chromium.chrome.browser;
+
+import org.chromium.base.CalledByNative;
+import org.chromium.content.browser.JsResultReceiver;
+import org.chromium.content.browser.JsPromptResultReceiver;
+
+public class JsResultHandler implements JsResultReceiver, JsPromptResultReceiver {
+    private int mNativeDialogPointer;
+    private boolean mSentResult;
+    private boolean mClientCalledConfirmOrCancel;
+
+    @CalledByNative
+    public static JsResultHandler create(int nativeDialogPointer) {
+        return new JsResultHandler(nativeDialogPointer);
+    }
+
+    private JsResultHandler(int nativeDialogPointer) {
+        mNativeDialogPointer = nativeDialogPointer;
+    }
+
+    /**
+     * Called by native when the embedder returns false from WebChromeClient.onJs*
+     * (i.e. to indicate that the framework should handle the dialog). Setting this
+     * flag means that no matter what the user does with this JsResult, we won't pay
+     * attention to it as we are going to invoke the built in handler.
+     */
+    @CalledByNative
+    private void setHandledByNative() {
+        mSentResult = true;
+    }
+
+    /**
+     * @return Whether confirm() or cancel() has been called before this function is called.
+     *     If true, when setJsResultHandledByNative is called, this dismisses the dialog to
+     *     warn about the wrong usage of the API.
+     */
+    @CalledByNative
+    private boolean clientHasCalledConfirmOrCancel() {
+        return mClientCalledConfirmOrCancel;
+    }
+
+    @Override
+    public void confirm() {
+        confirm(null);
+    }
+
+    @Override
+    public void confirm(String promptResult) {
+        if (mSentResult || mClientCalledConfirmOrCancel) return;
+
+        mClientCalledConfirmOrCancel = true;
+        nativeConfirmJsResult(mNativeDialogPointer, promptResult);
+    }
+
+    @Override
+    public void cancel() {
+        if (mSentResult || mClientCalledConfirmOrCancel) return;
+
+        mClientCalledConfirmOrCancel = true;
+        nativeCancelJsResult(mNativeDialogPointer);
+    }
+
+    private native void nativeConfirmJsResult(int dialogPointer, String promptResult);
+    private native void nativeCancelJsResult(int dialogPointer);
+}