Remove kMaxBindingsPerGroup limit

kMaxBindingsPerGroup is not a real WebGPU limit. Code in Dawn that
uses it now uses dynamically sized vectors, optimistic stack_vecs or
a different limit like kMaxDynamicBuffersPerPipelineLayout.

The CL introduces kMaxOptimalBindingsPerGroup=32 which is used to size
the static portion of stack_vecs, but the value is tentative.

Bug: dawn:443
Change-Id: I08e06bed6531bed8b4365f36cf2fc0579ac5f180
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/23502
Commit-Queue: Austin Eng <enga@chromium.org>
Reviewed-by: Stephen White <senorblanco@chromium.org>

src/dawn_native/opengl/PipelineGL.h

@@ -36,10 +36,6 @@ namespace dawn_native { namespace opengl {
                         const PipelineLayout* layout,
                         const PerStage<const ShaderModule*>& modules);
 
-        using BindingLocations = ityp::array<BindGroupIndex,
-                                             ityp::array<BindingIndex, GLint, kMaxBindingsPerGroup>,
-                                             kMaxBindGroups>;
-
         // For each unit a sampler is bound to we need to know if we should use filtering or not
         // because int and uint texture are only complete without filtering.
         struct SamplerUnit {

src/dawn_native/opengl/PipelineLayoutGL.cpp

@@ -30,6 +30,7 @@ namespace dawn_native { namespace opengl {
 
         for (BindGroupIndex group : IterateBitSet(GetBindGroupLayoutsMask())) {
             const BindGroupLayoutBase* bgl = GetBindGroupLayout(group);
+            mIndexInfo[group].resize(bgl->GetBindingCount());
 
             for (BindingIndex bindingIndex{0}; bindingIndex < bgl->GetBindingCount();
                  ++bindingIndex) {

src/dawn_native/opengl/PipelineLayoutGL.h

@@ -18,6 +18,7 @@
 #include "dawn_native/PipelineLayout.h"
 
 #include "common/ityp_array.h"
+#include "common/ityp_vector.h"
 #include "dawn_native/BindingInfo.h"
 #include "dawn_native/opengl/opengl_platform.h"
 
@@ -30,9 +31,7 @@ namespace dawn_native { namespace opengl {
         PipelineLayout(Device* device, const PipelineLayoutDescriptor* descriptor);
 
         using BindingIndexInfo =
-            ityp::array<BindGroupIndex,
-                        ityp::array<BindingIndex, GLuint, kMaxBindingsPerGroup>,
-                        kMaxBindGroups>;
+            ityp::array<BindGroupIndex, ityp::vector<BindingIndex, GLuint>, kMaxBindGroups>;
         const BindingIndexInfo& GetBindingIndexInfo() const;
 
         GLuint GetTextureUnitsUsed() const;