Look for GL_ARB_texture_rectangle on SwiftShader contexts

Bug: skia:9832
Change-Id: Id3841a36dc94f16db4c06398944a7b0497344ccd
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/289136
Commit-Queue: Greg Daniel <egdaniel@google.com>
Auto-Submit: Brian Salomon <bsalomon@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>

Author: bsalomon

src/gpu/gl/GrGLCaps.cpp

@@ -235,7 +235,8 @@ void GrGLCaps::init(const GrContextOptions& contextOptions,
             fRectangleTextureSupport = true;
         }
     } else if (GR_IS_GR_GL_ES(standard)) {
-        if (kChromium_GrGLDriver == ctxInfo.driver()) {
+        if (ctxInfo.driver() == kChromium_GrGLDriver ||
+            ctxInfo.driver() == kSwiftShader_GrGLDriver) {
             fRectangleTextureSupport = ctxInfo.hasExtension("GL_ARB_texture_rectangle");
         } else {
             // ANGLE will advertise the extension in ES2 contexts but actually using the texture in