Bug 962629 - Respect max texture size when creating Gralloc textures. r=nical

Add a size hint parameter to CreateTextureClientForDrawing, and use said
parameter to not create Gralloc surfaces that are bigger than the maximum
texture size.

gfx/layers/client/ImageClient.cpp

@@ -240,7 +240,7 @@ ImageClientSingle::UpdateImageInternal(ImageContainer* aContainer,
       gfxImageFormat format
         = gfxPlatform::GetPlatform()->OptimalFormatForContent(gfx::ContentForFormat(surface->GetFormat()));
       mFrontBuffer = CreateTextureClientForDrawing(gfx::ImageFormatToSurfaceFormat(format),
-                                                   mTextureFlags);
+                                                   mTextureFlags, size);
       MOZ_ASSERT(mFrontBuffer->AsTextureClientDrawTarget());
       if (!mFrontBuffer->AsTextureClientDrawTarget()->AllocateForSurface(size)) {
         mFrontBuffer = nullptr;