Add Intel macOS workaround for WebGL2 canvas_sub_rectangle tests

third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp

Index: third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp
diff --git a/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp b/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp
index 99ce2366d8a5c6e0ba444cb93e3265fc061f68e5..61c04afc8b86c269af57215443b2fe5d1a27839f 100644
--- a/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp
+++ b/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp
@@ -5004,7 +5004,14 @@ void WebGLRenderingContextBase::texImageHelperHTMLCanvasElement(
           unpackImageHeight, &selectingSubRectangle)) {
     return;
   }
-
+  bool forceRedundant2dCanvasCopy =
+      this->canvas() && this->canvas()->document().settings() &&
+      this->canvas()->document().settings()->forceRedundant2dCanvasCopy();
+  AccelerationHint hint;
+  if (forceRedundant2dCanvasCopy)
+    hint = PreferAccelerationWithExtraSurfaceCopy;
+  else
+    hint = PreferAcceleration;
   if (functionID == TexImage2D || functionID == TexSubImage2D) {
     // texImageByGPU relies on copyTextureCHROMIUM which doesn't support
     // float/integer/sRGB internal format.
@@ -5016,7 +5023,7 @@ void WebGLRenderingContextBase::texImageHelperHTMLCanvasElement(
       // 2D canvas has only FrontBuffer.
       texImageImpl(functionID, target, level, internalformat, xoffset, yoffset,
                    zoffset, format, type,
-                   canvas->copiedImage(FrontBuffer, PreferAcceleration).get(),
+                   canvas->copiedImage(FrontBuffer, hint).get(),
                    WebGLImageConversion::HtmlDomCanvas, m_unpackFlipY,
                    m_unpackPremultiplyAlpha, sourceSubRectangle, 1, 0);
       return;
@@ -5044,12 +5051,11 @@ void WebGLRenderingContextBase::texImageHelperHTMLCanvasElement(
     // TODO(zmo): Implement GPU-to-GPU copy path (crbug.com/612542).
     // Note that code will also be needed to copy to layers of 3D
     // textures, and elements of 2D texture arrays.
-    texImageImpl(functionID, target, level, internalformat, xoffset, yoffset,
-                 zoffset, format, type,
-                 canvas->copiedImage(FrontBuffer, PreferAcceleration).get(),
-                 WebGLImageConversion::HtmlDomCanvas, m_unpackFlipY,
-                 m_unpackPremultiplyAlpha, sourceSubRectangle, depth,
-                 unpackImageHeight);
+    texImageImpl(
+        functionID, target, level, internalformat, xoffset, yoffset, zoffset,
+        format, type, canvas->copiedImage(FrontBuffer, hint).get(),
+        WebGLImageConversion::HtmlDomCanvas, m_unpackFlipY,
+        m_unpackPremultiplyAlpha, sourceSubRectangle, depth, unpackImageHeight);
   }
 }