Add more validations for input state

This change sets limit for stride in VertexInputDescriptor and
offset in VertexAttributeDescriptor, and adds validation code
for them.

It also uses existing descriptors to replace redundant definitions.

BUG=dawn:107

Change-Id: Ifbb07f48ec9a5baae8ae8d21865dc384670b759a
Reviewed-on: https://dawn-review.googlesource.com/c/4901
Commit-Queue: Yunchao He <yunchao.he@intel.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>

src/dawn_native/d3d12/InputStateD3D12.cpp

diff --git a/src/dawn_native/d3d12/InputStateD3D12.cpp b/src/dawn_native/d3d12/InputStateD3D12.cpp
index 9178423..edeb4c0 100644
--- a/src/dawn_native/d3d12/InputStateD3D12.cpp
+++ b/src/dawn_native/d3d12/InputStateD3D12.cpp
@@ -71,7 +71,7 @@
 
             D3D12_INPUT_ELEMENT_DESC& inputElementDescriptor = mInputElementDescriptors[count++];
 
-            const AttributeInfo& attribute = GetAttribute(i);
+            const VertexAttributeDescriptor& attribute = GetAttribute(i);
 
             // If the HLSL semantic is TEXCOORDN the SemanticName should be "TEXCOORD" and the
             // SemanticIndex N
@@ -80,7 +80,7 @@
             inputElementDescriptor.Format = VertexFormatType(attribute.format);
             inputElementDescriptor.InputSlot = attribute.inputSlot;
 
-            const InputInfo& input = GetInput(attribute.inputSlot);
+            const VertexInputDescriptor& input = GetInput(attribute.inputSlot);
 
             inputElementDescriptor.AlignedByteOffset = attribute.offset;
             inputElementDescriptor.InputSlotClass = InputStepModeFunction(input.stepMode);