Fix naming style of GetUkmParameters().

Before this change it was ukm_parameters(), which is against Blink
naming convention.

Also have the functions return a const ref.

Bug: None
Change-Id: Ie527e69712be37ac5b362d462acf9b2e376e7a29
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2366115
Commit-Queue: Dylan Cutler <dylancutler@google.com>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800813}

third_party/blink/renderer/core/html/canvas/canvas_rendering_context_host.h

@@ -108,7 +108,9 @@ class CORE_EXPORT CanvasRenderingContextHost : public CanvasResourceHost,
   // blink::CanvasImageSource
   bool IsOffscreenCanvas() const override;
 
-  base::Optional<UkmParameters> ukm_parameters() { return ukm_params_; }
+  const base::Optional<UkmParameters>& GetUkmParameters() {
+    return ukm_params_;
+  }
 
  protected:
   ~CanvasRenderingContextHost() override {}

third_party/blink/renderer/modules/webgl/webgl_rendering_context_base.cc

@@ -3285,7 +3285,7 @@ void WebGLRenderingContextBase::RecordIdentifiableGLParameterDigest(
     IdentifiableToken value) {
   if (!IsUserInIdentifiabilityStudy() || !IsIdentifiableGLParam(pname))
     return;
-  if (base::Optional<UkmParameters> ukm_params = ukm_parameters()) {
+  if (const auto& ukm_params = GetUkmParameters()) {
     blink::IdentifiabilityMetricBuilder(ukm_params->source_id)
         .Set(blink::IdentifiableSurface::FromTypeAndInput(
                  blink::IdentifiableSurface::Type::kWebGLParameter, pname),
@@ -4583,8 +4583,7 @@ void WebGLRenderingContextBase::readPixels(
     GLenum type,
     MaybeShared<DOMArrayBufferView> pixels) {
   if (IsUserInIdentifiabilityStudy()) {
-    base::Optional<UkmParameters> ukm_params = ukm_parameters();
-    if (ukm_params) {
+    if (const auto& ukm_params = GetUkmParameters()) {
       blink::IdentifiabilityMetricBuilder(ukm_params->source_id)
           .Set(blink::IdentifiableSurface::FromTypeAndInput(
                    blink::IdentifiableSurface::Type::kCanvasReadback,

third_party/blink/renderer/modules/webgl/webgl_rendering_context_base.h

@@ -140,8 +140,8 @@ class MODULES_EXPORT WebGLRenderingContextBase : public CanvasRenderingContext,
     return static_cast<HTMLCanvasElement*>(Host());
   }
 
-  base::Optional<UkmParameters> ukm_parameters() const {
-    return Host()->ukm_parameters();
+  const base::Optional<UkmParameters>& GetUkmParameters() const {
+    return Host()->GetUkmParameters();
   }
 
   virtual String ContextName() const = 0;