WebGL: GL_RGB emulation for IOSurface backed textures. [For reference only]

third_party/WebKit/Source/platform/graphics/gpu/DrawingBuffer.cpp

Index: third_party/WebKit/Source/platform/graphics/gpu/DrawingBuffer.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/gpu/DrawingBuffer.cpp b/third_party/WebKit/Source/platform/graphics/gpu/DrawingBuffer.cpp
index 518f87bd312111fefa02c42d13e67eae68b2fa57..0a076575058f3c623a871aa429a544f90443d0ad 100644
--- a/third_party/WebKit/Source/platform/graphics/gpu/DrawingBuffer.cpp
+++ b/third_party/WebKit/Source/platform/graphics/gpu/DrawingBuffer.cpp
@@ -348,9 +348,15 @@ DrawingBuffer::TextureParameters DrawingBuffer::chromiumImageTextureParameters()
     // on OSX.
     TextureParameters parameters;
     parameters.target = GC3D_TEXTURE_RECTANGLE_ARB;
-    parameters.internalColorFormat = GL_BGRA_EXT;
-    parameters.internalRenderbufferFormat = GL_RGBA8_OES;
-    parameters.colorFormat = GL_RGBA;
+    if (m_requestedAttributes.alpha) {
+        parameters.internalColorFormat = GL_BGRA_EXT;
+        parameters.internalRenderbufferFormat = GL_RGBA8_OES;
+        parameters.colorFormat = GL_RGBA;
+    } else {
+        parameters.internalColorFormat = GL_BGR_EXT;
+        parameters.internalRenderbufferFormat = GL_RGB8_OES;
+        parameters.colorFormat = GL_RGB;
+    }
     return parameters;
 #else
     return defaultTextureParameters();
@@ -958,12 +964,6 @@ void DrawingBuffer::deleteChromiumImageForTexture(TextureInfo* info)
 
 DrawingBuffer::TextureInfo DrawingBuffer::createTextureAndAllocateMemory(const IntSize& size)
 {
-    // TODO(erikchen): Add support for a CHROMIUM_image back buffer whose
-    // behavior mimics a texture with internal format GL_RGB.
-    // https://crbug.com/581777.
-    if (!m_requestedAttributes.alpha)
-        return createDefaultTextureAndAllocateMemory(size);
-
     if (!RuntimeEnabledFeatures::webGLImageChromiumEnabled())
         return createDefaultTextureAndAllocateMemory(size);