Auto merge of #14286 - gterzian:update_canvas_with_offscreen_context, r=jdm

Update to webrender 0.10.0

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Changes necessary to build servor with webrender 0.10.0

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- [ ] `./mach build -d` does not report any errors
- [ ] `./mach test-tidy` does not report any errors
- [ ] These changes fix #__ (github issue number if applicable).

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components/script_traits/Cargo.toml

@@ -25,7 +25,7 @@ ipc-channel = "0.5"
 libc = "0.2"
 msg = {path = "../msg"}
 net_traits = {path = "../net_traits"}
-offscreen_gl_context = "0.4"
+offscreen_gl_context = "0.5.0"
 plugins = {path = "../plugins"}
 profile_traits = {path = "../profile_traits"}
 rustc-serialize = "0.3.4"