Add WebAPK's tests in ChildProcessLauncherTest.

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 285a1eb8025616e16acfde1d8718286a3b899668..0d564076f142a1e0389662ac3d5b89db5efea625 100644
--- a/chrome/android/webapk/shell_apk/BUILD.gn
+++ b/chrome/android/webapk/shell_apk/BUILD.gn
@@ -24,20 +24,34 @@ declare_args() {
 
 shell_apk_manifest_package =
     "org.chromium.webapk.$webapk_manifest_package_origin"
+test_shell_apk_manifest_package = "org.chromium.webapk.template.test"
 
-shell_apk_manifest = "$target_gen_dir/shell_apk_manifest/AndroidManifest.xml"
+webapk_common_jinja_variables = [
+  "host_url=$webapk_start_url",
+  "scope_url=$webapk_scope_url",
+  "scope_url_host=$webapk_scope_url_host",
+]
+
+webapk_jinja_variables = [
+  "manifest_package=$shell_apk_manifest_package",
+  "runtime_host=$webapk_runtime_host",
+]
+
+test_webapk_jinja_variables = [
+  "manifest_package=$test_shell_apk_manifest_package",
+  "runtime_host=org.chromium.chrome",
+]
 
 jinja_template("shell_apk_manifest") {
   input = "AndroidManifest.xml"
-  output = shell_apk_manifest
-
-  variables = [
-    "manifest_package=$shell_apk_manifest_package",
-    "host_url=$webapk_start_url",
-    "runtime_host=$webapk_runtime_host",
-    "scope_url=$webapk_scope_url",
-    "scope_url_host=$webapk_scope_url_host",
-  ]
+  output = "$target_gen_dir/shell_apk_manifest/AndroidManifest.xml"
+  variables = webapk_common_jinja_variables + webapk_jinja_variables
+}
+
+jinja_template("test_shell_apk_manifest") {
+  input = "AndroidManifest.xml"
+  output = "$target_gen_dir/test_shell_apk_manifest/AndroidManifest.xml"
+  variables = webapk_common_jinja_variables + test_webapk_jinja_variables
 }
 
 android_resources("shell_apk_resources") {
@@ -52,24 +66,49 @@ android_library("dex_loader_lib") {
 # Template for WebAPK. When a WebAPK is generated:
 # - Android manifest is customized to the website.
 # - App icon is extracted from the website and added to the APK's resources.
-android_apk("webapk") {
-  android_manifest = shell_apk_manifest
+template("webapk_template") {
+  android_apk(target_name) {
+    forward_variables_from(invoker, "*")
+    java_files = [
+      "src/org/chromium/webapk/shell_apk/MainActivity.java",
+      "src/org/chromium/webapk/shell_apk/WebApkServiceFactory.java",
+    ]
+    deps += [
+      ":dex_loader_lib",
+      ":shell_apk_manifest",
+      ":shell_apk_resources",
+      "//chrome/android/webapk/libs/common",
+      "//chrome/android/webapk/libs/runtime_library",
+    ]
+    if (!is_debug) {
+      proguard_enabled = true
+      proguard_configs = [ "//chrome/android/java/proguard.flags" ]
+    }
+  }
+}
+
+webapk_template("webapk") {
+  android_manifest = get_target_outputs(":shell_apk_manifest")
+  android_manifest = android_manifest[1]
   apk_name = "WebApk.$webapk_manifest_package_origin"
-  java_files = [
-    "src/org/chromium/webapk/shell_apk/MainActivity.java",
-    "src/org/chromium/webapk/shell_apk/WebApkServiceFactory.java",
-  ]
+
   deps = [
-    ":dex_loader_lib",
     ":shell_apk_manifest",
-    ":shell_apk_resources",
-    "//chrome/android/webapk/libs/common",
-    "//chrome/android/webapk/libs/runtime_library",
   ]
-  if (!is_debug) {
-    proguard_enabled = true
-    proguard_configs = [ "//chrome/android/java/proguard.flags" ]
-  }
+}
+
+# The |test_webapk| target is used for WebAPK's instrumentation tests in the
+# target chrome_public_test_apk. |test_webapk|'s package name and runtime
+# host are set to be compatible with the instrumentation tests and are not
+# customizable.
+webapk_template("test_webapk") {
+  android_manifest = get_target_outputs(":test_shell_apk_manifest")
+  android_manifest = android_manifest[1]
+  apk_name = "TestWebApk"
+
+  deps = [
+    ":test_shell_apk_manifest",
+  ]
 }
 
 android_library("shell_apk_javatests") {