Bug 728614 - Part 0: Allow querying the viewport information from Java; r=dougt

widget/android/AndroidJavaWrappers.cpp

@@ -76,6 +76,8 @@ jfieldID AndroidGeckoEvent::jLocationField = 0;
 jfieldID AndroidGeckoEvent::jAddressField = 0;
 jfieldID AndroidGeckoEvent::jBandwidthField = 0;
 jfieldID AndroidGeckoEvent::jCanBeMeteredField = 0;
+jfieldID AndroidGeckoEvent::jTabIdField = 0;
+jmethodID AndroidGeckoEvent::jDoCallbackMethod = 0;
 
 jclass AndroidPoint::jPointClass = 0;
 jfieldID AndroidPoint::jXField = 0;
@@ -208,6 +210,9 @@ AndroidGeckoEvent::InitGeckoEventClass(JNIEnv *jEnv)
     jAddressField = getField("mAddress", "Landroid/location/Address;");
     jBandwidthField = getField("mBandwidth", "D");
     jCanBeMeteredField = getField("mCanBeMetered", "Z");
+
+    jTabIdField = getField("mTabId", "I");
+    jDoCallbackMethod = getMethod("doCallback", "(Ljava/lang/String;)V");
 }
 
 void
@@ -585,6 +590,10 @@ AndroidGeckoEvent::Init(JNIEnv *jenv, jobject jobj)
             break;
         }
 
+        case META_VIEWPORT_QUERY:
+            mTabId = jenv->GetIntField(jobj, jTabIdField);
+            break;
+
         case VIEWPORT:
         case BROADCAST: {
             ReadCharactersField(jenv);
@@ -665,6 +674,16 @@ AndroidPoint::Init(JNIEnv *jenv, jobject jobj)
     }
 }
 
+void
+AndroidGeckoEvent::DoCallback(const nsAString& data) {
+    JNIEnv* env = AndroidBridge::GetJNIEnv();
+    if (!env)
+        return;
+    AndroidBridge::AutoLocalJNIFrame(env, 1);
+    jstring jData = env->NewString(nsPromiseFlatString(data).get(), data.Length());
+    env->CallVoidMethod(wrapped_obj, jDoCallbackMethod, jData);
+}
+
 void
 AndroidGeckoGLLayerClient::Init(jobject jobj)
 {