Support ARGB_8888 by default in GLHelperReadbackSupport

content/common/gpu/client/gl_helper_readback_support.cc

Index: content/common/gpu/client/gl_helper_readback_support.cc
diff --git a/content/common/gpu/client/gl_helper_readback_support.cc b/content/common/gpu/client/gl_helper_readback_support.cc
index 28bae135670a8e9886e44cbcf2454a607714b261..476f88520d4ad0b2908c1223b991c0e466f53998 100644
--- a/content/common/gpu/client/gl_helper_readback_support.cc
+++ b/content/common/gpu/client/gl_helper_readback_support.cc
@@ -37,7 +37,8 @@ void GLHelperReadbackSupport::CheckForReadbackSupport(
       supports_format = SupportsFormat(GL_RGB, GL_UNSIGNED_SHORT_5_6_5);
       break;
     case SkBitmap::kARGB_8888_Config:
-      supports_format = SupportsFormat(GL_RGBA, GL_UNSIGNED_BYTE);
+      // This is the baseline, assume always true.
+      supports_format = true;
       break;
     case SkBitmap::kARGB_4444_Config:
       supports_format = false;