Implement window.print() on Android

chrome/browser/android/tab_android.cc

 // 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.
 
 #include "chrome/browser/android/tab_android.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
 #include "base/android/jni_string.h"
 #include "base/debug/trace_event.h"
@@ skipping 614 matching lines @@
   if (jurl)
     url = base::android::ConvertJavaStringToUTF8(env, jurl);
 
   content::NavigationEntry* entry =
       web_contents()->GetController().GetVisibleEntry();
   if (entry && url == entry->GetVirtualURL().spec())
     entry->SetTitle(title);
 }
 
 bool TabAndroid::Print(JNIEnv* env, jobject obj) {
-  if (!web_contents())
+  LOG(INFO) << "DGN TabAndroid::Print";
+  if (!web_contents()) {
+    LOG(INFO) << "DGN TabAndroid::Print - No webcontents";
     return false;
+  }
 
   printing::PrintViewManagerBasic::CreateForWebContents(web_contents());
   printing::PrintViewManagerBasic* print_view_manager =
       printing::PrintViewManagerBasic::FromWebContents(web_contents());
-  if (print_view_manager == NULL)
+  if (print_view_manager == NULL) {
+    LOG(INFO) << "DGN TabAndroid::Print - No print_view_manager";
     return false;
+  }
 
   print_view_manager->PrintNow();
   return true;
 }
 
+void TabAndroid::ShowPrintDialog() {
+  JNIEnv* env = base::android::AttachCurrentThread();
+  Java_Tab_showPrintDialog(env, weak_java_tab_.get(env).obj());
+}
+
 ScopedJavaLocalRef<jobject> TabAndroid::GetDefaultFavicon(JNIEnv* env,
                                                           jobject obj) {
   ScopedJavaLocalRef<jobject> bitmap;
   FaviconTabHelper* favicon_tab_helper =
       FaviconTabHelper::FromWebContents(web_contents_.get());
 
   if (!favicon_tab_helper)
     return bitmap;
 
   // Always return the default favicon in Android.
@@ skipping 30 matching lines @@
 
 static void Init(JNIEnv* env, jobject obj) {
   TRACE_EVENT0("native", "TabAndroid::Init");
   // This will automatically bind to the Java object and pass ownership there.
   new TabAndroid(env, obj);
 }
 
 bool TabAndroid::RegisterTabAndroid(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }