Load web contents after tab is created.

chrome/android/BUILD.gn

Index: chrome/android/BUILD.gn
diff --git a/chrome/android/BUILD.gn b/chrome/android/BUILD.gn
index a8fd756acb9196a2e20533e27e973bfcf9d6d71b..cb9732ae74b921167bf6c2582e75060d5e93a576 100644
--- a/chrome/android/BUILD.gn
+++ b/chrome/android/BUILD.gn
@@ -116,6 +116,7 @@ android_library("chrome_java") {
 }
 
 # GYP: //chrome/chrome_browser.gypi:activity_type_ids_java
+# GYP: //chrome/chrome_browser.gypi:add_web_contents_result_java
 # GYP: //chrome/chrome_browser.gypi:profile_account_management_metrics_java
 # GYP: //chrome/chrome_browser.gypi:profile_sync_service_model_type_selection_java
 # GYP: //chrome/chrome_browser.gypi:tab_load_status_java
@@ -123,6 +124,7 @@ android_library("chrome_java") {
 java_cpp_enum("chrome_android_java_enums_srcjar") {
   sources = [
     "//chrome/browser/android/activity_type_ids.h",
+    "//chrome/browser/android/chrome_web_contents_delegate_android.h",
     "//chrome/browser/android/tab_android.h",
     "//chrome/browser/profiles/profile_metrics.h",
     "//chrome/browser/sync/profile_sync_service_android.cc",
@@ -130,6 +132,7 @@ java_cpp_enum("chrome_android_java_enums_srcjar") {
   ]
   outputs = [
     "org/chromium/chrome/browser/ActivityTypeIds.java",
+    "org/chromium/chrome/browser/AddWebContentsResults.java",
     "org/chromium/chrome/browser/TabLoadStatus.java",
     "org/chromium/chrome/browser/profiles/ProfileAccountManagementMetrics.java",
     "org/chromium/chrome/browser/sync/ModelTypeSelection.java",