[Android] Add API for specifying a charset for data Urls.

content/public/android/java/src/org/chromium/content/browser/LoadUrlParams.java

 // 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.content.browser;
 
 import org.chromium.base.CalledByNative;
 import org.chromium.base.JNINamespace;
 
 import java.util.Map;
@@ skipping 45 matching lines @@
         mVirtualUrlForDataUrl = null;
     }
 
     /**
      * Helper method to create a LoadUrlParams object for data url.
      * @param data Data to be loaded.
      * @param mimeType Mime type of the data.
      * @param isBase64Encoded True if the data is encoded in Base 64 format.
      */
     public static LoadUrlParams createLoadDataParams(
-            String data, String mimeType, boolean isBase64Encoded) {
+        String data, String mimeType, boolean isBase64Encoded) {
+        return createLoadDataParams(data, mimeType, isBase64Encoded, null);
+    }
+
+    /**
+     * Helper method to create a LoadUrlParams object for data url.
+     * @param data Data to be loaded.
+     * @param mimeType Mime type of the data.
+     * @param isBase64Encoded True if the data is encoded in Base 64 format.
+     * @param charset The character set for the data. Pass null if the mime type
+     *                does not require a special charset.
+     */
+    public static LoadUrlParams createLoadDataParams(
+            String data, String mimeType, boolean isBase64Encoded, String charset) {
         StringBuilder dataUrl = new StringBuilder("data:");
         dataUrl.append(mimeType);
+        if (charset != null && !charset.isEmpty()) {
+            dataUrl.append(";charset=" + charset);
+        }
         if (isBase64Encoded) {
             dataUrl.append(";base64");
         }
         dataUrl.append(",");
         dataUrl.append(data);
 
         LoadUrlParams params = new LoadUrlParams(dataUrl.toString());
         params.setLoadType(LoadUrlParams.LOAD_TYPE_DATA);
         params.setTransitionType(ContentViewCore.PAGE_TRANSITION_TYPED);
         return params;
     }
 
     /**
      * Helper method to create a LoadUrlParams object for data url with base
      * and virtual url.
      * @param data Data to be loaded.
      * @param mimeType Mime type of the data.
      * @param isBase64Encoded True if the data is encoded in Base 64 format.
      * @param baseUrl Base url of this data load. Note that for WebView compatibility,
      *                baseUrl and historyUrl are ignored if this is a data: url.
      *                Defaults to about:blank if null.
      * @param historyUrl History url for this data load. Note that for WebView compatibility,
      *                   this is ignored if baseUrl is a data: url. Defaults to about:blank
      *                   if null.
      */
     public static LoadUrlParams createLoadDataParamsWithBaseUrl(
             String data, String mimeType, boolean isBase64Encoded,
             String baseUrl, String historyUrl) {
-        LoadUrlParams params = createLoadDataParams(data, mimeType, isBase64Encoded);
+        return createLoadDataParamsWithBaseUrl(data, mimeType, isBase64Encoded,
+                baseUrl, historyUrl, null);
+    }
+
+    /**
+     * Helper method to create a LoadUrlParams object for data url with base
+     * and virtual url.
+     * @param data Data to be loaded.
+     * @param mimeType Mime type of the data.
+     * @param isBase64Encoded True if the data is encoded in Base 64 format.
+     * @param baseUrl Base url of this data load. Note that for WebView compatibility,
+     *                baseUrl and historyUrl are ignored if this is a data: url.
+     *                Defaults to about:blank if null.
+     * @param historyUrl History url for this data load. Note that for WebView compatibility,
+     *                   this is ignored if baseUrl is a data: url. Defaults to about:blank
+     *                   if null.
+     * @param charset The character set for the data. Pass null if the mime type
+     *                does not require a special charset.
+     */
+    public static LoadUrlParams createLoadDataParamsWithBaseUrl(
+            String data, String mimeType, boolean isBase64Encoded,
+            String baseUrl, String historyUrl, String charset) {
+        LoadUrlParams params = createLoadDataParams(data, mimeType, isBase64Encoded, charset);
         // For WebView compatibility, when the base URL has the 'data:'
         // scheme, we treat it as a regular data URL load and skip setting
         // baseUrl and historyUrl.
+        // TODO(joth): we should just append baseURL and historyURL here, and move the
+        // WebView specific transform up to a wrapper factory function in android_webview/.
         if (baseUrl == null || !baseUrl.toLowerCase().startsWith("data:")) {
             params.setBaseUrlForDataUrl(baseUrl != null ? baseUrl : "about:blank");
             params.setVirtualUrlForDataUrl(historyUrl != null ? historyUrl : "about:blank");
         }
         return params;
     }
 
     /**
      * Helper method to create a LoadUrlParams object for an HTTP POST load.
      * @param url URL of the load.
@@ skipping 141 matching lines @@
         UA_OVERRIDE_FALSE = ua_override_false;
         UA_OVERRIDE_TRUE = ua_override_true;
     }
 
     /**
      * Parses |url| as a GURL on the native side, and
      * returns true if it's scheme is data:.
      */
     private static native boolean nativeIsDataScheme(String url);
 }