Fix Slimming Paint WebGL printing

Source/platform/graphics/GraphicsContext.cpp

Index: Source/platform/graphics/GraphicsContext.cpp
diff --git a/Source/platform/graphics/GraphicsContext.cpp b/Source/platform/graphics/GraphicsContext.cpp
index 49355dcfdb7ecb4ddc9f0f4cce190add78ecff72..6e0d04afe53013f1eb2edd9e1ea2bf2340116e78 100644
--- a/Source/platform/graphics/GraphicsContext.cpp
+++ b/Source/platform/graphics/GraphicsContext.cpp
@@ -1060,7 +1060,9 @@ void GraphicsContext::drawBitmapRect(const SkBitmap& bitmap, const SkRect* src,
     // Textures are bound to the blink main-thread GrContext, which can not be
     // used on the compositor raster thread.
     // FIXME: Mailbox support would make this possible in the GPU-raster case.
-    ASSERT(!isRecording() || !bitmap.getTexture());
+    // If we're printing it is safe to access the texture because we are always
+    // on main thread, even if the other conditions are not met.
+    ASSERT(!isRecording() || !bitmap.getTexture() || printing());
     if (contextDisabled())
         return;