Make retry logic more permissive for network errors (#83965)

packages/flutter_tools/lib/src/android/gradle_errors.dart

@@ -50,8 +50,8 @@ enum GradleBuildStatus {
   retryWithAarPlugins,
 }
 
-/// Returns a simple test function that evaluates to [true] if
-/// [errorMessage] is contained in the error message.
+/// Returns a simple test function that evaluates to `true` if at least one of
+/// `errorMessages` is contained in the error message.
 GradleErrorTest _lineMatcher(List<String> errorMessages) {
   return (String line) {
     return errorMessages.any((String errorMessage) => line.contains(errorMessage));
@@ -118,7 +118,7 @@ final GradleHandledError networkErrorHandler = GradleHandledError(
     'javax.net.ssl.SSLHandshakeException: Remote host closed connection during handshake',
     'java.net.SocketException: Connection reset',
     'java.io.FileNotFoundException',
-    'Gateway Time-out'
+    "> Could not get resource 'http",
   ]),
   handler: ({
     required String line,

packages/flutter_tools/test/general.shard/android/gradle_errors_test.dart

@@ -298,6 +298,38 @@ A problem occurred configuring root project 'android'.
       FileSystem: () => MemoryFileSystem.test(),
       ProcessManager: () => FakeProcessManager.any(),
     });
+
+    testUsingContext('retries if Gradle could not get a resource (non-Gateway)', () async {
+      const String errorMessage = '''
+* Error running Gradle:
+Exit code 1 from: /home/travis/build/flutter/flutter sdk/examples/flutter_gallery/android/gradlew app:properties:
+Starting a Gradle Daemon (subsequent builds will be faster)
+Picked up _JAVA_OPTIONS: -Xmx2048m -Xms512m
+FAILURE: Build failed with an exception.
+* What went wrong:
+A problem occurred configuring root project 'android'.
+> Could not resolve all files for configuration ':classpath'.
+   > Could not resolve com.android.tools.build:gradle:3.1.2.
+     Required by:
+         project :
+      > Could not resolve com.android.tools.build:gradle:3.1.2.
+         > Could not get resource 'https://dl.google.com/dl/android/maven2/com/android/tools/build/gradle/3.1.2/gradle-3.1.2.pom'.
+            > Could not GET 'https://dl.google.com/dl/android/maven2/com/android/tools/build/gradle/3.1.2/gradle-3.1.2.pom'.
+               > Remote host closed connection during handshake''';
+
+      expect(formatTestErrorMessage(errorMessage, networkErrorHandler), isTrue);
+      expect(await networkErrorHandler.handler(), equals(GradleBuildStatus.retry));
+
+      expect(testLogger.errorText,
+        contains(
+          'Gradle threw an error while downloading artifacts from the network. '
+          'Retrying to download...'
+        )
+      );
+    }, overrides: <Type, Generator>{
+      FileSystem: () => MemoryFileSystem.test(),
+      ProcessManager: () => FakeProcessManager.any(),
+    });
   });
 
   group('permission errors', () {