Add Search Web to selection controls on iOS

shell/platform/darwin/ios/framework/Source/FlutterPlatformPlugin.mm

@@ -16,6 +16,7 @@
 
 constexpr char kTextPlainFormat[] = "text/plain";
 const UInt32 kKeyPressClickSoundId = 1306;
+const NSString* searchURLPrefix = @"x-web-search://?";
 
 }  // namespace
 
@@ -115,6 +116,9 @@ - (void)handleMethodCall:(FlutterMethodCall*)call result:(FlutterResult)result {
     result([self clipboardHasStrings]);
   } else if ([method isEqualToString:@"LiveText.isLiveTextInputAvailable"]) {
     result(@([self isLiveTextInputAvailable]));
+  } else if ([method isEqualToString:@"SearchWeb.invoke"]) {
+    [self searchWeb:args];
+    result(nil);
   } else if ([method isEqualToString:@"LookUp.invoke"]) {
     [self showLookUpViewController:args];
     result(nil);
@@ -123,6 +127,17 @@ - (void)handleMethodCall:(FlutterMethodCall*)call result:(FlutterResult)result {
   }
 }
 
+- (void)searchWeb:(NSString*)searchTerm {
+  NSString* escapedText = [searchTerm
+      stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet
+                                                             URLHostAllowedCharacterSet]];
+  NSString* searchURL = [NSString stringWithFormat:@"%@%@", searchURLPrefix, escapedText];
+
+  [[UIApplication sharedApplication] openURL:[NSURL URLWithString:searchURL]
+                                     options:@{}
+                           completionHandler:nil];
+}
+
 - (void)playSystemSound:(NSString*)soundType {
   if ([soundType isEqualToString:@"SystemSoundType.click"]) {
     // All feedback types are specific to Android and are treated as equal on

shell/platform/darwin/ios/framework/Source/FlutterPlatformPluginTest.mm

@@ -17,6 +17,7 @@ @interface FlutterPlatformPluginTest : XCTestCase
 
 @interface FlutterPlatformPlugin ()
 - (BOOL)isLiveTextInputAvailable;
+- (void)searchWeb:(NSString*)searchTerm;
 - (void)showLookUpViewController:(NSString*)term;
 @end
 
@@ -27,6 +28,30 @@ - (void)presentViewController:(UIViewController*)viewControllerToPresent
 @end
 
 @implementation FlutterPlatformPluginTest
+- (void)testSearchWebInvoked {
+  FlutterEngine* engine = [[[FlutterEngine alloc] initWithName:@"test" project:nil] autorelease];
+  std::unique_ptr<fml::WeakPtrFactory<FlutterEngine>> _weakFactory =
+      std::make_unique<fml::WeakPtrFactory<FlutterEngine>>(engine);
+  [engine runWithEntrypoint:nil];
+
+  XCTestExpectation* invokeExpectation =
+      [self expectationWithDescription:@"Web search launched with search term"];
+
+  FlutterPlatformPlugin* plugin =
+      [[[FlutterPlatformPlugin alloc] initWithEngine:_weakFactory->GetWeakPtr()] autorelease];
+  FlutterPlatformPlugin* mockPlugin = OCMPartialMock(plugin);
+
+  FlutterMethodCall* methodCall = [FlutterMethodCall methodCallWithMethodName:@"SearchWeb.invoke"
+                                                                    arguments:@"Test"];
+
+  FlutterResult result = ^(id result) {
+    OCMVerify([mockPlugin searchWeb:@"Test"]);
+    [invokeExpectation fulfill];
+  };
+
+  [mockPlugin handleMethodCall:methodCall result:result];
+  [self waitForExpectationsWithTimeout:1 handler:nil];
+}
 
 - (void)testLookUpCallInitiated {
   FlutterEngine* engine = [[[FlutterEngine alloc] initWithName:@"test" project:nil] autorelease];