[Reland] Fix ReadPixels from float fbo buffer in ES2/WebGL1.

content/test/gpu/gpu_tests/webgl_conformance_expectations.py

 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 import os
 
 from gpu_tests.gpu_test_expectations import GpuTestExpectations
 
 # See the GpuTestExpectations class for documentation.
 
 class WebGLConformanceExpectations(GpuTestExpectations):
@@ skipping 86 matching lines @@
     self.Fail('deqp/data/gles2/shaders/functions.html',
         bug=478572)
     self.Fail('conformance/extensions/ext-sRGB.html',
         bug=540900)
 
     # We need to add WebGL 1 check in command buffer that format/type from
     # TexSubImage2D have to match the current texture's.
     self.Fail('conformance/textures/misc/tex-sub-image-2d-bad-args.html',
         bug=570453)
 
-    self.Fail('conformance/extensions/oes-texture-half-float.html',
-        bug=607283)
-
     # Fails on multiple platforms
 
     # OpenGL / NVIDIA failures
     self.Fail('conformance/attribs/gl-disabled-vertex-attrib.html',
         ['win', 'linux', 'nvidia', 'opengl'], bug=1007) # angle bug ID
 
     # Win failures
+    self.Fail('conformance/extensions/oes-texture-half-float.html',
+        ['win'], bug=607283)
     # Note that the following two tests pass with OpenGL.
     self.Fail('conformance/glsl/bugs/' +
               'pow-of-small-constant-in-user-defined-function.html',
         ['win'], bug=485641)
     # Note that the following test seems to pass, but it may still be flaky.
     self.Fail('conformance/glsl/constructors/' +
               'glsl-construct-vec-mat-index.html',
               ['win'], bug=525188)
     self.Flaky('deqp/data/gles2/shaders/constants.html', ['win'], bug=594922)
 
@@ skipping 339 matching lines @@
     self.Fail('conformance/textures/misc/texture-npot.html',
         ['chromeos', ('intel', 0xa011)], bug=375554)
     self.Fail('conformance/textures/misc/texture-npot-video.html',
         ['chromeos', ('intel', 0xa011)], bug=375554)
     self.Fail('conformance/textures/misc/texture-size.html',
         ['chromeos', ('intel', 0xa011)], bug=375554)
     self.Fail('conformance/uniforms/gl-uniform-arrays.html',
         ['chromeos', ('intel', 0xa011)], bug=375554)
     self.Skip('conformance/uniforms/uniform-default-values.html',
         ['chromeos', ('intel', 0xa011)], bug=375554)