[canvaskit] Disable getError calls for webGL

getError is known to be problematic for performance on Chrome
because it is synchronous. Disabling this should improve
performance in several cases.

Change-Id: I0d4a68ddb9625f09d7427e3c5f36883352c4f995
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/289779
Reviewed-by: Brian Salomon <bsalomon@google.com>

modules/canvaskit/CHANGELOG.md

@@ -21,6 +21,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Changed
  - CanvasKit colors are now represented with a TypedArray of four floats.
  - Safari now defaults to using WebGL1 instead of WebGL2 (skbug.com/10171)
+ - Calls to `getError` should be disabled. This may cause a performance improvement in some scenarios.
 
 ### Removed
  - SkPaint.setColorf is obsolete and removed. setColor accepts a CanvasKit color which is
@@ -30,7 +31,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Deprecated
  - `SkCanvas.concat44` has been folded into concat (which now takes 3x2, 3x3, or 4x4 matrices). It will
    be removed soon.
-   
+
 ### Fixed
  - Memory leak in paragraph binding code (https://github.com/flutter/flutter/issues/56938)
 

src/gpu/gl/GrGLCaps.cpp

@@ -335,6 +335,10 @@ void GrGLCaps::init(const GrContextOptions& contextOptions,
     }  // No WebGL support
 
     fSkipErrorChecks = ctxInfo.driver() == kChromium_GrGLDriver;
+    if (GR_IS_GR_WEBGL(standard)) {
+        // Error checks are quite costly in webgl, especially in Chrome.
+        fSkipErrorChecks = true;
+    }
 
     /**************************************************************************
     * GrShaderCaps fields