Add support for webapk without runtimeHost

chrome/android/webapk/shell_apk/BUILD.gn

Index: chrome/android/webapk/shell_apk/BUILD.gn
diff --git a/chrome/android/webapk/shell_apk/BUILD.gn b/chrome/android/webapk/shell_apk/BUILD.gn
index 97d6fd5db7d0bd6b5870d844a78d4beec9c89672..0e3217e83b57b13cf4a39c2165d346d5f3a6b8d1 100644
--- a/chrome/android/webapk/shell_apk/BUILD.gn
+++ b/chrome/android/webapk/shell_apk/BUILD.gn
@@ -114,6 +114,7 @@ android_library("webapk_java") {
   java_files = [
     "src/org/chromium/webapk/shell_apk/DexLoader.java",
     "src/org/chromium/webapk/shell_apk/HostBrowserClassLoader.java",
+    "src/org/chromium/webapk/shell_apk/ChooseHostBrowserDialogFragment.java",
     "src/org/chromium/webapk/shell_apk/MainActivity.java",
     "src/org/chromium/webapk/shell_apk/WebApkSandboxedProcessService.java",
     "src/org/chromium/webapk/shell_apk/WebApkSandboxedProcessService0.java",
@@ -125,6 +126,7 @@ android_library("webapk_java") {
   deps = [
     ":shell_apk_resources",
     "//chrome/android/webapk/libs/common:common_java",
+    "//third_party/android_tools:android_support_v7_appcompat_java",
   ]
 }
 
@@ -240,11 +242,12 @@ android_library("shell_apk_javatests") {
 junit_binary("webapk_shell_apk_junit_tests") {
   java_files = [
     "junit/src/org/chromium/webapk/shell_apk/HostBrowserClassLoaderTest.java",
-    "junit/src/org/chromium/webapk/shell_apk/MainActivityTest.java",
+    "junit/src/org/chromium/webapk/shell_apk/WebApkUtilsTest.java",
   ]
   deps = [
     ":webapk_java",
     "//chrome/android/webapk/libs/common:common_java",
     "//chrome/android/webapk/test:junit_test_support",
+    "//third_party/android_tools:android_support_v7_appcompat_java",
   ]
 }