Repository: flutter
Issue: bug(FlexibleSpaceBar): titlePadding incorrect on iPhone 11 in landscape
Labels: platform-ios,framework,f: material design,has reproducible steps,P3,found in release: 3.0,found in release: 3.1,workaround available,team-design,triaged-design

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## Steps to Reproduce

<!-- You must include full steps to reproduce so that we can reproduce the problem. -->

1. Run `flutter create bug`.
2. Update the files as follows:
```dart
  static const double _appBarHeight = 256.0;
...
          SliverAppBar(
            expandedHeight: _appBarHeight,
            pinned: true,
            flexibleSpace: FlexibleSpaceBar(
              title: Text('name'),
              centerTitle: false,
            ),
          ),
```

**Expected results:** <!-- what did you want to see? -->
Title shouldn't overlap the back button.

Ideally, only landscape mode on devices with the camera bump would add extra padding. 

**Actual results:** <!-- what did you see? -->
Title is overlaps the back button.

Portrait is fine, but landscape doesn't account for the extra padding due to the iPhone's camera bump:
![IMG_0535](https://user-images.githubusercontent.com/6323077/86045073-09d31a80-ba19-11ea-9aa1-f2543bc4db8a.jpg)

Portrait, for comparison:
![IMG_0536](https://user-images.githubusercontent.com/6323077/86045068-093a8400-ba19-11ea-932c-554b256035c2.jpg)

<details>
  <summary>Logs</summary>

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```
```

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```
```

<!-- Finally, paste the output of running `flutter doctor -v` here. -->

```
chris@Shem tipr % flutter doctor -v
[✓] Flutter (Channel stable, v1.17.4, on Mac OS X 10.15.5 19F101, locale en-US)
    • Flutter version 1.17.4 at /Users/chris/dev/flutter
    • Framework revision 1ad9baa8b9 (12 days ago), 2020-06-17 14:41:16 -0700
    • Engine revision ee76268252
    • Dart version 2.8.4

 
[!] Android toolchain - develop for Android devices (Android SDK version 29.0.3)
    • Android SDK at /Users/chris/Library/Android/sdk
    • Platform android-29, build-tools 29.0.3
    • Java binary at: /Users/chris/Library/Application Support/JetBrains/Toolbox/apps/AndroidStudio/ch-0/193.6514223/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)
    ! Some Android licenses not accepted.  To resolve this, run: flutter doctor --android-licenses

[✓] Xcode - develop for iOS and macOS (Xcode 11.5)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 11.5, Build version 11E608c
    • CocoaPods version 1.9.3

[✓] Android Studio (version 4.0)
    • Android Studio at /Users/chris/Library/Application Support/JetBrains/Toolbox/apps/AndroidStudio/ch-0/193.6514223/Android Studio.app/Contents
    • Flutter plugin version 46.0.2
    • Dart plugin version 193.7361
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)

[!] IntelliJ IDEA Ultimate Edition (version 2020.1.2)
    • IntelliJ at /Users/chris/Applications/JetBrains Toolbox/IntelliJ IDEA Ultimate.app
    ✗ Flutter plugin not installed; this adds Flutter specific functionality.
    ✗ Dart plugin not installed; this adds Dart specific functionality.
    • For information about installing plugins, see
      https://flutter.dev/intellij-setup/#installing-the-plugins

[✓] VS Code (version 1.46.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.12.0

[✓] Connected device (1 available)
    • Eli • 00008030-001E2D343CA2802E • ios • iOS 13.5.1

! Doctor found issues in 2 categories.
```

</details>