Implement window.print() on Android

printing/android/java/src/org/chromium/printing/PrintingContext.java

 // Copyright 2013 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.printing;
 
 import android.print.PrintDocumentAdapter;
 import android.util.SparseArray;
 
 import org.chromium.base.CalledByNative;
@@ skipping 79 matching lines @@
         return mController.getPageWidth();
     }
 
     @CalledByNative
     public int getHeight() {
         ThreadUtils.assertOnUiThread();
         return mController.getPageHeight();
     }
 
     @CalledByNative
+    public void showPrintDialog() {
+        ThreadUtils.assertOnUiThread();
+        if (mController != null) {  // The native side doesn't check if printing is enabled
+            mController.startPendingPrint(this);
+        } else {
+            // Printing disabled. Notify the native side to stop waiting.
+            showSystemDialogDone();
+        }
+    }
+
+    @CalledByNative
     public static void pdfWritingDone(int fd, boolean success) {
         ThreadUtils.assertOnUiThread();
         // TODO(cimamoglu): Do something when fd == -1.
         if (PRINTING_CONTEXT_MAP.get(fd) != null) {
             ThreadUtils.assertOnUiThread();
             PrintingContext printingContext = PRINTING_CONTEXT_MAP.get(fd);
             printingContext.mController.pdfWritingDone(success);
             PRINTING_CONTEXT_MAP.remove(fd);
         }
     }
@@ skipping 12 matching lines @@
             // NOTE: We don't call nativeAskUserForSettingsReply (hence Chromium callback in
             // AskUserForSettings callback) twice.  See {@link PrintingControllerImpl#onFinish}
             // for more explanation.
             nativeAskUserForSettingsReply(mNativeObject, false);
         } else {
             mController.setPrintingContext(this);
             mController.pageCountEstimationDone(maxPages);
         }
     }
 
+    @Override
+    public void showSystemDialogDone() {
+        nativeShowSystemDialogDone(mNativeObject);
+    }
+
     private native void nativeAskUserForSettingsReply(
             long nativePrintingContextAndroid,
             boolean success);
+
+    private native void nativeShowSystemDialogDone(long nativePrintingContextAndroid);
 }