[Offline Pages] Added OfflinePageEvaluationBridge for testing.

chrome/browser/BUILD.gn

Index: chrome/browser/BUILD.gn
diff --git a/chrome/browser/BUILD.gn b/chrome/browser/BUILD.gn
index c27862b22620e6222f40d14b0c6c285e94cb95cb..35c08e7747589503af489d83b70fe2d68336ed46 100644
--- a/chrome/browser/BUILD.gn
+++ b/chrome/browser/BUILD.gn
@@ -3880,6 +3880,13 @@ if (android_java_ui) {
     jni_package = "chrome"
   }
 
+  generate_jni("jni_headers_offline") {
+    sources = [
+      "../android/java/src/org/chromium/chrome/browser/offlinepages/evaluation/OfflinePageEvaluationBridge.java",
+    ]
+    jni_package = "chrome/offlinepages"
+  }
+
   proto_library("client_discourse_context_proto") {
     sources = [
       "android/proto/client_discourse_context.proto",
@@ -4079,6 +4086,22 @@ static_library("test_support") {
     ]
   }
 
+  if (is_android) {
+    testonly = true
+    sources += [
+      "android/offline_pages/evaluation/offline_page_evaluation_bridge.cc",
+      "android/offline_pages/evaluation/offline_page_evaluation_bridge.h",
+      "android/offline_pages/evaluation/offline_page_evaluation_jni_onload.cc",
+      "android/offline_pages/evaluation/offline_page_evaluation_jni_onload.h",
+    ]
+    deps += [
+      ":jni_headers_offline",
+      "//components/offline_pages",
+      "//components/offline_pages/background:background_offliner",
+      "//components/offline_pages/downloads:offline_pages_ui_adapter",
+    ]
+  }
+
   if (enable_extensions) {
     sources += [
       "extensions/extension_action_test_util.cc",