[ios] Added API to enable/disable web usage for WebState.

ios/web/public/test/test_web_state.mm

Index: ios/web/public/test/test_web_state.mm
diff --git a/ios/web/public/test/test_web_state.mm b/ios/web/public/test/test_web_state.mm
index 1ed98150cd1417d99b614645587cfccd73e25648..296cb885f84c2505e9cc6bbf5242233d9096c987 100644
--- a/ios/web/public/test/test_web_state.mm
+++ b/ios/web/public/test/test_web_state.mm
@@ -11,14 +11,12 @@
 namespace web {
 
 TestWebState::TestWebState()
-    : trust_level_(kAbsolute), content_is_html_(true) {}
+    : web_usage_enabled_(false),
+      trust_level_(kAbsolute),
+      content_is_html_(true) {}
 
 TestWebState::~TestWebState() = default;
 
-UIView* TestWebState::GetView() {
-  return nullptr;
-}
-
 WebStateDelegate* TestWebState::GetDelegate() {
   return nil;
 }
@@ -29,6 +27,18 @@ BrowserState* TestWebState::GetBrowserState() const {
   return nullptr;
 }
 
+bool TestWebState::IsWebUsageEnabled() const {
+  return web_usage_enabled_;
+}
+
+void TestWebState::SetWebUsageEnabled(bool enabled) {
+  web_usage_enabled_ = enabled;
+}
+
+UIView* TestWebState::GetView() {
+  return nullptr;
+}
+
 NavigationManager* TestWebState::GetNavigationManager() {
   return nullptr;
 }