Vulkan: Fix sync of initially disabled attributes.

src/libANGLE/Context.cpp

@@ -7758,11 +7758,10 @@ void StateCache::updateActiveAttribsMask(Context *context)
 
     const AttributesMask &clientAttribs  = vao->getClientAttribsMask();
     const AttributesMask &enabledAttribs = vao->getEnabledAttributesMask();
+    const AttributesMask &activeEnabled  = activeAttribs & enabledAttribs;
 
-    activeAttribs &= enabledAttribs;
-
-    mCachedActiveClientAttribsMask   = activeAttribs & clientAttribs;
-    mCachedActiveBufferedAttribsMask = activeAttribs & ~clientAttribs;
+    mCachedActiveClientAttribsMask   = activeEnabled & clientAttribs;
+    mCachedActiveBufferedAttribsMask = activeEnabled & ~clientAttribs;
     mCachedActiveDefaultAttribsMask  = activeAttribs & ~enabledAttribs;
     mCachedHasAnyEnabledClientAttrib = (clientAttribs & enabledAttribs).any();
 }

src/libANGLE/renderer/vulkan/VertexArrayVk.cpp

@@ -93,6 +93,9 @@ VertexArrayVk::VertexArrayVk(const gl::VertexArrayState &state, RendererVk *rend
     mDynamicVertexData.init(1, renderer);
     mDynamicIndexData.init(1, renderer);
     mTranslatedByteIndexData.init(1, renderer);
+
+    // Initially consider all inputs dirty.
+    mDirtyPackedInputs.set();
 }
 
 VertexArrayVk::~VertexArrayVk()

src/tests/gl_tests/VertexAttributeTest.cpp

@@ -961,10 +961,6 @@ TEST_P(VertexAttributeTest, DisabledAttribArrays)
     // TODO: Support this test on Vulkan.  http://anglebug.com/2797
     ANGLE_SKIP_TEST_IF(IsLinux() && IsVulkan() && IsIntel());
 
-    // TODO: Fix syncing of default attributes when there is no call to enable/disable.
-    // http://anglebug.com/2800
-    ANGLE_SKIP_TEST_IF(IsVulkan());
-
     constexpr char vsSource[] =
         "attribute vec4 a_position;\n"
         "attribute vec4 a_color;\n"