Upgrade blink side ReadPixels size validation to consider ES3 pack parameters.

third_party/WebKit/Source/modules/webgl/WebGL2RenderingContextBase.cpp

 // Copyright 2015 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.
 
 #include "modules/webgl/WebGL2RenderingContextBase.h"
 
 #include "bindings/modules/v8/WebGLAny.h"
 #include "core/html/HTMLCanvasElement.h"
 #include "core/html/HTMLImageElement.h"
 #include "core/html/HTMLVideoElement.h"
@@ skipping 3425 matching lines @@
     ASSERT(unit < m_samplerUnits.size());
 
     WebGLSampler* sampler = m_samplerUnits[unit];
 
     if (sampler)
         return sampler->getSamplerState();
 
     return WebGLRenderingContextBase::getTextureUnitSamplerState(target, unit);
 }
 
+WebGLImageConversion::PixelStoreParams WebGL2RenderingContextBase::getPackPixelStoreParams()
+{
+    WebGLImageConversion::PixelStoreParams params;
+    params.alignment = m_packAlignment;
+    params.rowLength = m_packRowLength;
+    params.skipPixels = m_packSkipPixels;
+    params.skipRows = m_packSkipRows;
+    return params;
+}
+
+WebGLImageConversion::PixelStoreParams WebGL2RenderingContextBase::getUnpackPixelStoreParams()
+{
+    WebGLImageConversion::PixelStoreParams params;
+    params.alignment = m_unpackAlignment;
+    params.rowLength = m_unpackRowLength;
+    params.imageHeight = m_unpackImageHeight;
+    params.skipPixels = m_unpackSkipPixels;
+    params.skipRows = m_unpackSkipRows;
+    params.skipImages = m_unpackSkipImages;
+    return params;
+}
+
 } // namespace blink