Add a cap for geometry shader invocations

Bug: skia:7116
Change-Id: I3cc2ce7b2e5123c9adfd9781b2a5a8553747dfa5
Reviewed-on: https://skia-review.googlesource.com/56000
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
diff --git a/src/gpu/vk/GrVkCaps.cpp b/src/gpu/vk/GrVkCaps.cpp
index c92c7d5..1b0db7f 100644
--- a/src/gpu/vk/GrVkCaps.cpp
+++ b/src/gpu/vk/GrVkCaps.cpp
@@ -242,7 +242,9 @@
     // GrShaderCaps
 
     shaderCaps->fShaderDerivativeSupport = true;
+
     shaderCaps->fGeometryShaderSupport = SkToBool(featureFlags & kGeometryShader_GrVkFeatureFlag);
+    shaderCaps->fGSInvocationsSupport = shaderCaps->fGeometryShaderSupport;
 
     shaderCaps->fDualSourceBlendingSupport = SkToBool(featureFlags & kDualSrcBlend_GrVkFeatureFlag);
     if (kAMD_VkVendor == properties.vendorID) {