I think all hardware features (video, webgl) in webview don't work in webview, because emulator used to not support all the GL extensions that webview needs. I don't know if that's still the case with the latest emulator though.

If you want to try it, make sure you enable hardware emulation, and change this line in webview and set it to false: https://cs.chromium.org/chromium/src/android_webview/java/src/org/chromium/android_webview/AwContents.java?rcl=27a1d93030604b777013fafab121a4e6e0ead70f&l=119

If it works and things don't blow up, then report back exactly which emulator you are using and we can see about removing that check.

For now this is working as expected

Emulator setting:
Graphics: Hardware-GLES2.0

If changes below code
private static final boolean FORCE_AUXILIARY_BITMAP_RENDERING =
            "goldfish".equals(Build.HARDWARE) || "ranchu".equals(Build.HARDWARE);
to
private static final boolean FORCE_AUXILIARY_BITMAP_RENDERING = false;

How to build "webview.apk"(external/chromium-webview/prebuilt/arm/webview.apk),
now my build environment can build out "ChromePublic.apk SystemWebView.apk AndroidWebView.apk", but could not build out "webview.apk"

Thanks a lots!

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https://www.chromium.org/developers/how-tos/build-instructions-android-webview

Compare extract files between webview.apk and AndroidWebView.apk or SystemWebView.apk, but could not find "libwebviewchromium.so"(only one in webview.apk/lib/armeabi-v7a) in AndroidWebView.apk or SystemWebView.apk, why?

Need to build release version?

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SystemWebView.apk is the correct thing. The filename is just different in the Android tree for historical reasons - it's just renamed.

The contents are different because you've done a different type of build (debug vs release, as you guessed) but it doesn't matter; the debug one will work fine.