Use draws instead of clears as temporary workaround for Qualcomm stencil clear bug

Review URL: https://codereview.chromium.org/885863003
diff --git a/src/gpu/gl/GrGLCaps.cpp b/src/gpu/gl/GrGLCaps.cpp
index 73df30b..8d2cb52 100644
--- a/src/gpu/gl/GrGLCaps.cpp
+++ b/src/gpu/gl/GrGLCaps.cpp
@@ -402,7 +402,8 @@
     }
 
     if (kPowerVR54x_GrGLRenderer == ctxInfo.renderer() ||
-        kPowerVRRogue_GrGLRenderer == ctxInfo.renderer()) {
+        kPowerVRRogue_GrGLRenderer == ctxInfo.renderer() ||
+        kQualcomm_GrGLVendor == ctxInfo.vendor()) {
         fUseDrawInsteadOfClear = true;
     }