Implement Android WebView.clearCache

android_webview/java/src/org/chromium/android_webview/AwContents.java

Index: android_webview/java/src/org/chromium/android_webview/AwContents.java
diff --git a/android_webview/java/src/org/chromium/android_webview/AwContents.java b/android_webview/java/src/org/chromium/android_webview/AwContents.java
index 635d16b74de0b7dabd81f69a68bc9a02e9651a91..f0083a1ee839779c3a26f3bb59a76dda6bd6fe04 100644
--- a/android_webview/java/src/org/chromium/android_webview/AwContents.java
+++ b/android_webview/java/src/org/chromium/android_webview/AwContents.java
@@ -150,6 +150,13 @@ public class AwContents {
     //  WebView[Provider] method implementations (where not provided by ContentViewCore)
     //--------------------------------------------------------------------------------------------
 
+    /**
+     * TODO(boliu): javadoc.
+     */
+    public void clearCache() {
+        nativeClearCache(mNativeAwContents);
+    }
+
     public void documentHasImages(Message message) {
         nativeDocumentHasImages(mNativeAwContents, message);
     }
@@ -317,4 +324,5 @@ public class AwContents {
     private native void nativeFindAllAsync(int nativeAwContents, String searchString);
     private native void nativeFindNext(int nativeAwContents, boolean forward);
     private native void nativeClearMatches(int nativeAwContents);
+    private native void nativeClearCache(int nativeAwContents);
 }