Moves android specific code into android directory

shell/BUILD.gn

Index: shell/BUILD.gn
diff --git a/shell/BUILD.gn b/shell/BUILD.gn
index 54685559be53e5424c73d223cfd3d2d89b60be1e..c9856e0873cbce95353bcd1b8700899222260235 100644
--- a/shell/BUILD.gn
+++ b/shell/BUILD.gn
@@ -160,8 +160,6 @@ source_set("lib") {
     "task_runners.h",
     "test_child_process.cc",
     "test_child_process.h",
-    "ui_application_loader_android.cc",
-    "ui_application_loader_android.h",
   ]
 
   deps = [
@@ -192,10 +190,12 @@ source_set("lib") {
 
   if (is_android) {
     sources += [
-      "android/android_handler.h",
       "android/android_handler.cc",
-      "android/android_handler_loader.h",
+      "android/android_handler.h",
       "android/android_handler_loader.cc",
+      "android/android_handler_loader.h",
+      "android/ui_application_loader_android.cc",
+      "android/ui_application_loader_android.h",
     ]
 
     deps += [
@@ -223,7 +223,7 @@ if (is_android) {
       "android/apk/src/org/chromium/mojo_shell_apk/Bootstrap.java",
       "android/apk/src/org/chromium/mojo_shell_apk/MojoMain.java",
     ]
-    jni_package = "mojo"
+    jni_package = "mojo/shell"
   }
 
   android_library("bootstrap_java") {