Increase maximum width/height of canvas.

Fixes WebGL conformance test:
conformance2/textures/misc/tex-subimage3d-canvas-bug.html

The test expects to be able to create a canvas larger than 32767 in
height. Skia seems to support this, and there have been user requests
for it.

Bug: 859400, 339725, skia:2122
Change-Id: Ibba89e98178bd73817c7b4cbdf569e89ee5764b1
Reviewed-on: https://chromium-review.googlesource.com/c/1356555Reviewed-by: Fernando Serboncini <fserb@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: James Darpinian <jdarpinian@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613225}

content/test/gpu/gpu_tests/webgl2_conformance_expectations.py

@@ -56,12 +56,6 @@ class WebGL2ConformanceExpectations(WebGLConformanceExpectations):
         'conformance2/glsl3/const-struct-from-array-as-function-parameter.html',
         ['win', 'nvidia', 'opengl'], bug=874620)
 
-    # Failing new test added in https://github.com/KhronosGroup/WebGL/pull/2665
-    self.Fail('conformance2/textures/misc/tex-subimage3d-canvas-bug.html',
-              ['linux'], bug=859400)
-    self.Fail('conformance2/textures/misc/tex-subimage3d-canvas-bug.html',
-              ['win', 'opengl', 'passthrough'], bug=859400)
-
     # Too slow (take about one hour to run)
     self.Skip('deqp/functional/gles3/builtinprecision/*.html', bug=619403)
 

third_party/blink/renderer/platform/graphics/skia/skia_utils.h

@@ -56,8 +56,8 @@ enum {
   // maximum dimensions, in exchange for a smaller maximum canvas size.
   kMaxCanvasArea = 32768 * 8192,  // Maximum canvas area in CSS pixels
 
-  // In Skia, we will also limit width/height to 32767.
-  kMaxSkiaDim = 32767  // Maximum width/height in CSS pixels.
+  // In Skia, we will also limit width/height to 65535.
+  kMaxSkiaDim = 65535  // Maximum width/height in CSS pixels.
 };
 
 bool PLATFORM_EXPORT IsValidImageSize(const IntSize&);

third_party/blink/web_tests/fast/canvas/canvas-large-pattern.html

@@ -15,12 +15,7 @@ test(function(t) {
     dstContext.fillStyle = pattern;
     dstContext.fillRect(0, 0, dstCanvas.width, dstCanvas.height);
 
-    // This test does not currently succeed because skia does not handle
-    // canvases more than 32k pixels wide. For now, this test serves the
-    // purpose of verifying that this use case does not crash the browser.
-    // Crasher bug: crbug.com/281504.
-    // The result, if Skia handled large canvases, would be [0, 255, 0, 255]
-    assert_array_equals(dstContext.getImageData(0, 0, 1, 1).data, [0, 0, 0, 0]);
+    assert_array_equals(dstContext.getImageData(0, 0, 1, 1).data, [0, 255, 0, 255]);
 
     assert_array_equals(dstContext.getImageData(1, 0, 1, 1).data, [0, 0, 0, 0]);
     assert_array_equals(dstContext.getImageData(0, 1, 1, 1).data, [0, 0, 0, 0]);