[video_player] Add network cache functionality

## Steps to Reproduce I built this sample: https://github.com/flutter/plugins/tree/master/packages/video_player/example (v0.10.0+2) and switched tab from side to side. Downloaded videos are disappear and started redownloading every time. ## Flutter Doctor ``` [√] Flutter (Channel beta, v0.11.10, on Microsoft Windows [Version 10.0.17763.316], locale ja-JP) • Flutter version 0.11.10 at C:\flutter • Framework revision c27c4a265e (3 months ago), 2018-11-26 17:07:24 -0500 • Engine revision eebc6a5895 • Dart version 2.1.0 (build 2.1.0-dev.9.4 f9ebf21297) [√] Android toolchain - develop for Android devices (Android SDK 28.0.3) • Android SDK at C:\Users\XXXXXXXX\AppData\Local\Android\sdk • Android NDK location not configured (optional; useful for native profiling support) • Platform android-28, build-tools 28.0.3 • Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1248-b01) • All Android licenses accepted. [√] Android Studio (version 3.3) • Android Studio at C:\Program Files\Android\Android Studio • Flutter plugin version 33.0.1 • Dart plugin version 182.5215 • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1248-b01) [√] Connected device (1 available) • Pixel 3 • XXXXXXXXX • android-arm64 • Android 9 (API 28) • No issues found! ```

Posted by nagoya0 on Feb 18, 2019, 8:33 AM

Tags

• support (Healthcare)

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