Refactor Android printing code to make it more testable.

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

Index: chrome/android/java/src/org/chromium/chrome/browser/TabBase.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/TabBase.java b/chrome/android/java/src/org/chromium/chrome/browser/TabBase.java
index 75cfa085d154f91f69e4b9c11caafa06664d97e2..741f1ee3da29989d1a9e8a3e7061eb1e405483c3 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/TabBase.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/TabBase.java
@@ -309,7 +309,6 @@ public abstract class TabBase implements NavigationClient {
     }
 
     /**
-     *
      * @return The infobar container.
      */
     public final InfoBarContainer getInfoBarContainer() {
@@ -323,6 +322,16 @@ public abstract class TabBase implements NavigationClient {
     protected abstract AutoLoginProcessor createAutoLoginProcessor();
 
     /**
+     * Prints the current page.
+     *
+     * @return Whether the printing process is started successfully.
+     **/
+    public boolean print() {
+        assert mNativeTabAndroid != 0;
+        return nativePrint(mNativeTabAndroid);
+    }
+
+    /**
      * Reloads the current page content if it is a {@link ContentView}.
      */
     public void reload() {
@@ -771,4 +780,5 @@ public abstract class TabBase implements NavigationClient {
     private native int nativeGetSecurityLevel(int nativeTabAndroid);
     private native void nativeSetActiveNavigationEntryTitleForUrl(int nativeTabAndroid, String url,
             String title);
+    private native boolean nativePrint(int nativeTabAndroid);
 }