Added flag to disable the dart profiler on iOS (flutter#33907)

Author: gaaclarke

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

@@ -173,6 +173,12 @@
     settings.trace_systrace = enableTraceSystrace.boolValue;
   }
 
+  NSNumber* enableDartProfiling = [mainBundle objectForInfoDictionaryKey:@"FLTEnableDartProfiling"];
+  // Change the default only if the option is present.
+  if (enableDartProfiling != nil) {
+    settings.enable_dart_profiling = enableDartProfiling.boolValue;
+  }
+
   // Leak Dart VM settings, set whether leave or clean up the VM after the last shell shuts down.
   NSNumber* leakDartVM = [mainBundle objectForInfoDictionaryKey:@"FLTLeakDartVM"];
   // It will change the default leak_vm value in settings only if the key exists.

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

@@ -80,6 +80,15 @@ - (void)testEnableTraceSystraceSettingIsCorrectlyParsed {
   XCTAssertEqual(settings.trace_systrace, NO);
 }
 
+- (void)testEnableDartProflingSettingIsCorrectlyParsed {
+  NSBundle* mainBundle = [NSBundle mainBundle];
+  NSNumber* enableTraceSystrace = [mainBundle objectForInfoDictionaryKey:@"FLTEnableDartProfiling"];
+  XCTAssertNotNil(enableTraceSystrace);
+  XCTAssertEqual(enableTraceSystrace.boolValue, NO);
+  auto settings = FLTDefaultSettingsForBundle();
+  XCTAssertEqual(settings.trace_systrace, NO);
+}
+
 - (void)testEmptySettingsAreCorrect {
   XCTAssertFalse([FlutterDartProject allowsArbitraryLoads:[[NSDictionary alloc] init]]);
   XCTAssertEqualObjects(@"", [FlutterDartProject domainNetworkPolicy:[[NSDictionary alloc] init]]);

testing/ios/IosUnitTests/App/Info.plist

@@ -50,6 +50,8 @@
 	<false/>
 	<key>FLTTraceSystrace</key>
 	<false/>
+	<key>FLTEnableDartProfiling</key>
+	<false/>
 	<key>UIRequiredDeviceCapabilities</key>
 	<array>
 		<string>armv7</string>