Bug 1006198 - Apply Y flip if necessary to tiled Textures in ImageHost. r=nical

gfx/layers/composite/ImageHost.cpp

@@ -124,6 +124,10 @@ ImageHost::Composite(EffectChain& aEffectChain,
       } else {
         effect->mTextureCoords = Rect(0, 0, 1, 1);
       }
+      if (mFrontBuffer->GetFlags() & TextureFlags::NEEDS_Y_FLIP) {
+        effect->mTextureCoords.y = effect->mTextureCoords.YMost();
+        effect->mTextureCoords.height = -effect->mTextureCoords.height;
+      }
       GetCompositor()->DrawQuad(rect, aClipRect, aEffectChain,
                                 aOpacity, aTransform);
       GetCompositor()->DrawDiagnostics(DiagnosticFlags::IMAGE | DiagnosticFlags::BIGIMAGE,