Declare that LatinIME does not use cleartext network traffic.

This declares to the platform and tools that this app does not use
cleartext network traffic. The platform and tools will be blocking
(on best effort basis) attempts to use such traffic by this app.
For example, attempts to use HTTP (rather than HTTPS) will be blocked.

Bug: 19215516
Change-Id: I4c933a214457025797e077b72d8daf8a0c876923

java/AndroidManifest.xml

@@ -38,7 +38,8 @@
     <application android:label="@string/english_ime_name"
             android:icon="@drawable/ic_launcher_keyboard"
             android:supportsRtl="true"
-            android:allowBackup="true">
+            android:allowBackup="true"
+            android:usesCleartextTraffic="false">
 
         <!-- Services -->
         <service android:name="LatinIME"

tests/src/com/android/inputmethod/latin/network/HttpUrlConnectionBuilderTests.java

@@ -87,7 +87,7 @@ public class HttpUrlConnectionBuilderTests extends AndroidTestCase {
 
     public void testAddHeader() throws IOException {
         HttpUrlConnectionBuilder builder = new HttpUrlConnectionBuilder();
-        builder.setUrl("http://www.example.com");
+        builder.setUrl("https://www.example.com");
         builder.addHeader("some-random-key", "some-random-value");
         HttpURLConnection connection = builder.build();
         assertEquals("some-random-value", connection.getRequestProperty("some-random-key"));
@@ -95,14 +95,14 @@ public class HttpUrlConnectionBuilderTests extends AndroidTestCase {
 
     public void testSetUseCache_notSet() throws IOException {
         HttpUrlConnectionBuilder builder = new HttpUrlConnectionBuilder();
-        builder.setUrl("http://www.example.com");
+        builder.setUrl("https://www.example.com");
         HttpURLConnection connection = builder.build();
         assertFalse(connection.getUseCaches());
     }
 
     public void testSetUseCache_false() throws IOException {
         HttpUrlConnectionBuilder builder = new HttpUrlConnectionBuilder();
-        builder.setUrl("http://www.example.com");
+        builder.setUrl("https://www.example.com");
         HttpURLConnection connection = builder.build();
         connection.setUseCaches(false);
         assertFalse(connection.getUseCaches());
@@ -110,7 +110,7 @@ public class HttpUrlConnectionBuilderTests extends AndroidTestCase {
 
     public void testSetUseCache_true() throws IOException {
         HttpUrlConnectionBuilder builder = new HttpUrlConnectionBuilder();
-        builder.setUrl("http://www.example.com");
+        builder.setUrl("https://www.example.com");
         HttpURLConnection connection = builder.build();
         connection.setUseCaches(true);
         assertTrue(connection.getUseCaches());
@@ -118,7 +118,7 @@ public class HttpUrlConnectionBuilderTests extends AndroidTestCase {
 
     public void testSetMode_uploadOnly() throws IOException {
         HttpUrlConnectionBuilder builder = new HttpUrlConnectionBuilder();
-        builder.setUrl("http://www.example.com");
+        builder.setUrl("https://www.example.com");
         builder.setMode(MODE_UPLOAD_ONLY);
         HttpURLConnection connection = builder.build();
         assertTrue(connection.getDoInput());