Move uses-sdk to GN.

Bug: 891996
Change-Id: I64381bea1bcbddb76748dd03c7caaf2f5360e1ed
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1674258
Reviewed-by: Cody Northrop <cnorthrop@google.com>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>

android/AndroidManifest.xml.jinja2

@@ -9,10 +9,6 @@
           xmlns:tools="http://schemas.android.com/tools"
           package="{{manifest_package|default('com.chromium.angle')}}">
 
-    <uses-sdk android:minSdkVersion="26"
-              android:targetSdkVersion="28">
-    </uses-sdk>
-
     <application android:label="Angle for Android"
                  android:extractNativeLibs="false"
                  android:multiArch="true">

android/angle_apk.gni

@@ -41,6 +41,8 @@ template("angle_apk") {
     forward_variables_from(invoker, "*")
     android_manifest = manifest_path
     android_manifest_dep = ":$manifest_target_name"
+    min_sdk_version = 26
+    target_sdk_version = 28
     deps = [
       ":${invoker.package_name}_assets",
     ]