diff --git a/dom/canvas/test/webgl-conf/generated-mochitest.ini b/dom/canvas/test/webgl-conf/generated-mochitest.ini
index f569a0315a7f..dda7ff0930a8 100644
--- a/dom/canvas/test/webgl-conf/generated-mochitest.ini
+++ b/dom/canvas/test/webgl-conf/generated-mochitest.ini
@@ -5340,7 +5340,6 @@ fail-if = 1
 subsuite = webgl2-core
 [generated/test_2_conformance2__rendering__instanced-rendering-large-divisor.html]
 subsuite = webgl2-core
-skip-if = (os == 'win')
 [generated/test_2_conformance2__rendering__line-rendering-quality.html]
 subsuite = webgl2-core
 [generated/test_2_conformance2__rendering__multisampling-fragment-evaluation.html]
diff --git a/dom/canvas/test/webgl-conf/mochitest-errata.ini b/dom/canvas/test/webgl-conf/mochitest-errata.ini
index c68aad55fb2d..13552c2fd919 100644
--- a/dom/canvas/test/webgl-conf/mochitest-errata.ini
+++ b/dom/canvas/test/webgl-conf/mochitest-errata.ini
@@ -1172,6 +1172,3 @@ skip-if = (os == 'win')
 skip-if = (os == 'win')
 [generated/test_2_conformance__textures__misc__tex-video-using-tex-unit-non-zero.html]
 skip-if = (os == 'win')
-[generated/test_2_conformance2__rendering__instanced-rendering-large-divisor.html]
-# Assertion failed: static_cast<unsigned int>(packedAttrib.divisor) == divisor, file z:/build/build/src/gfx/angle/checkout/src/libANGLE/renderer/d3d/d3d11/InputLayoutCache.cpp, line 89
-skip-if = (os == 'win')
diff --git a/gfx/angle/checkout/out/gen/angle/id/commit.h b/gfx/angle/checkout/out/gen/angle/id/commit.h
index 80c8f7a2a2ad..00d8083f5133 100644
--- a/gfx/angle/checkout/out/gen/angle/id/commit.h
+++ b/gfx/angle/checkout/out/gen/angle/id/commit.h
@@ -1,3 +1,3 @@
-#define ANGLE_COMMIT_HASH "598f2502e3a4"
+#define ANGLE_COMMIT_HASH "790e8e6b4179"
 #define ANGLE_COMMIT_HASH_SIZE 12
-#define ANGLE_COMMIT_DATE "2018-10-09 13:54:05 -0700"
+#define ANGLE_COMMIT_DATE "2018-10-09 17:41:46 -0700"
diff --git a/gfx/angle/checkout/src/libANGLE/renderer/d3d/d3d11/InputLayoutCache.cpp b/gfx/angle/checkout/src/libANGLE/renderer/d3d/d3d11/InputLayoutCache.cpp
index 934503f5798a..84d9681678cd 100644
--- a/gfx/angle/checkout/src/libANGLE/renderer/d3d/d3d11/InputLayoutCache.cpp
+++ b/gfx/angle/checkout/src/libANGLE/renderer/d3d/d3d11/InputLayoutCache.cpp
@@ -59,7 +59,8 @@ struct PackedAttribute
     uint8_t attribType;
     uint8_t semanticIndex;
     uint8_t vertexFormatType;
-    uint8_t divisor;
+    uint8_t dummyPadding;
+    uint32_t divisor;
 };
 
 }  // anonymous namespace
@@ -81,17 +82,18 @@ void PackedAttributeLayout::addAttributeData(GLenum glType,
     packedAttrib.attribType       = static_cast<uint8_t>(attribType);
     packedAttrib.semanticIndex    = static_cast<uint8_t>(semanticIndex);
     packedAttrib.vertexFormatType = static_cast<uint8_t>(vertexFormatType);
-    packedAttrib.divisor          = static_cast<uint8_t>(divisor);
+    packedAttrib.dummyPadding     = 0u;
+    packedAttrib.divisor          = static_cast<uint32_t>(divisor);
 
     ASSERT(static_cast<gl::AttributeType>(packedAttrib.attribType) == attribType);
     ASSERT(static_cast<UINT>(packedAttrib.semanticIndex) == semanticIndex);
     ASSERT(static_cast<gl::VertexFormatType>(packedAttrib.vertexFormatType) == vertexFormatType);
     ASSERT(static_cast<unsigned int>(packedAttrib.divisor) == divisor);
 
-    static_assert(sizeof(uint32_t) == sizeof(PackedAttribute),
-                  "PackedAttributes must be 32-bits exactly.");
+    static_assert(sizeof(uint64_t) == sizeof(PackedAttribute),
+                  "PackedAttributes must be 64-bits exactly.");
 
-    attributeData[numAttributes++] = gl::bitCast<uint32_t>(packedAttrib);
+    attributeData[numAttributes++] = gl::bitCast<uint64_t>(packedAttrib);
 }
 
 bool PackedAttributeLayout::operator==(const PackedAttributeLayout &other) const
diff --git a/gfx/angle/checkout/src/libANGLE/renderer/d3d/d3d11/InputLayoutCache.h b/gfx/angle/checkout/src/libANGLE/renderer/d3d/d3d11/InputLayoutCache.h
index 4b1ebf575815..55fda46604e6 100644
--- a/gfx/angle/checkout/src/libANGLE/renderer/d3d/d3d11/InputLayoutCache.h
+++ b/gfx/angle/checkout/src/libANGLE/renderer/d3d/d3d11/InputLayoutCache.h
@@ -48,7 +48,7 @@ struct PackedAttributeLayout
 
     uint32_t numAttributes;
     uint32_t flags;
-    gl::AttribArray<uint32_t> attributeData;
+    gl::AttribArray<uint64_t> attributeData;
 };
 }  // namespace rx
 
diff --git a/gfx/angle/cherry_picks.txt b/gfx/angle/cherry_picks.txt
index 214d060acfb2..0045a11924e6 100644
--- a/gfx/angle/cherry_picks.txt
+++ b/gfx/angle/cherry_picks.txt
@@ -1,3 +1,23 @@
+commit 790e8e6b417905eca335d06c16ec54c977188110
+Author: Olli Etuaho <oetuaho@nvidia.com>
+Date:   Thu Sep 20 13:20:50 2018 +0300
+
+    Fix using a large vertex attrib divisor on D3D11
+    
+    A divisor >= 256 used to trigger an assert on the D3D11 backend since
+    it couldn't fit into the input layout cache. Increase the space
+    reserved for the divisor in the input layout cache to make sure that
+    the correct input layout will get used and to fix the assert.
+    
+    BUG=angleproject:2832
+    TEST=angle_end2end_tests
+    
+    Change-Id: I34eead6c4e8c4fea379bbafc8670b4e32a5b633b
+    Reviewed-on: https://chromium-review.googlesource.com/1236293
+    Reviewed-by: Jamie Madill <jmadill@chromium.org>
+    Reviewed-by: Geoff Lang <geofflang@chromium.org>
+    Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>
+
 commit 598f2502e3a41b76d90037e7858c43c18e66399d
 Merge: 8212058a6 e15a25c6f
 Author: Jeff Gilbert <jdashg@gmail.com>