Web Share Target implementation

[yuntan]

add share_target field to manifest.json
change compose text in componentWillMount of Compose

[yuntan]

doc:

• https://github.com/WICG/web-share-target/blob/master/docs/interface.md
• https://docs.google.com/document/d/19E6s2m18uL87BqgQdr773GMfdr5Os40aw4asbh0xxrY/edit#heading=h.xgjl2srtytjt

discussion: https://groups.google.com/a/chromium.org/forum/#!msg/blink-dev/_oUskZTzQxg/TwReQ2npBgAJ

[yuntan]

Chrome canary 65からインストールしたwebapk: org.chromium.webapk.a5e232d84511244b9
Chrome stable 63からインストールしたwebapk: org.chromium.webapk.a5e232d84511244b9

AndroidManifest.xmlのdiff

3c3
<     <application android:allowBackup="false" android:icon="@mipmap/app_icon" android:label="@string/short_name" android:supportsRtl="true">
---
>     <application android:allowBackup="false" android:icon="@mipmap/ic_launcher" android:label="@string/short_name" android:supportsRtl="true">
16,18c16,26
<         <meta-data android:name="org.chromium.webapk.shell_apk.shellApkVersion" android:value="28"/>
<         <meta-data android:name="org.chromium.webapk.shell_apk.runtimeHost" android:value="com.android.chrome"/>
<         <meta-data android:name="org.chromium.webapk.shell_apk.runtimeHostApplicationName" android:value="Chrome"/>
---
>         <activity android:excludeFromRecents="true" android:label="ますとどんちほー" android:name="org.chromium.webapk.shell_apk.ShareActivity0" android:theme="@android:style/Theme.Translucent.NoTitleBar">
>             <meta-data android:name="org.chromium.webapk.shell_apk.shareTemplate" android:value="https://mstdn.untan.xyz/web/status/new?title={title}&amp;text={text}&amp;url={url}"/>
>             <intent-filter>
>                 <action android:name="android.intent.action.SEND"/>
>                 <category android:name="android.intent.category.DEFAULT"/>
>                 <data android:mimeType="text/plain"/>
>             </intent-filter>
>         </activity>
>         <meta-data android:name="org.chromium.webapk.shell_apk.shellApkVersion" android:value="34"/>
>         <meta-data android:name="org.chromium.webapk.shell_apk.runtimeHost" android:value="com.chrome.canary"/>
>         <meta-data android:name="org.chromium.webapk.shell_apk.runtimeHostApplicationName" android:value="Chrome Canary"/>

共有用のActivityが追加されている

[yuntan]

Androidの実装のバグトラッキングページ https://bugs.chromium.org/p/chromium/issues/detail?id=761007
現時点の実装に関する情報 https://groups.google.com/a/chromium.org/d/msg/blink-dev/_oUskZTzQxg/DTQpMDBpBAAJ