NetInfo network quality extension: Add callbacks and Layout tests

third_party/WebKit/LayoutTests/netinfo/network-quality-expected.txt

Index: third_party/WebKit/LayoutTests/netinfo/network-quality-expected.txt
diff --git a/third_party/WebKit/LayoutTests/netinfo/network-quality-expected.txt b/third_party/WebKit/LayoutTests/netinfo/network-quality-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d807449cf3be94beaab4dd44de91823b30be40df
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+++ b/third_party/WebKit/LayoutTests/netinfo/network-quality-expected.txt
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+Tests that all rtt and downlink is exposed correctly.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+PASS connection.effectiveType is values[count][3]
+PASS connection.rtt is values[count][4]
+PASS connection.downlink is values[count][5]
+PASS connection.effectiveType is values[count][3]
+PASS connection.rtt is values[count][4]
+PASS connection.downlink is values[count][5]
+PASS connection.effectiveType is values[count][3]
+PASS connection.rtt is values[count][4]
+PASS connection.downlink is values[count][5]
+PASS connection.effectiveType is values[count][3]
+PASS connection.rtt is values[count][4]
+PASS connection.downlink is values[count][5]
+PASS connection.effectiveType is values[count][3]
+PASS connection.rtt is values[count][4]
+PASS connection.downlink is values[count][5]
+PASS connection.effectiveType is values[count][3]
+PASS connection.rtt is values[count][4]
+PASS connection.downlink is values[count][5]
+PASS connection.effectiveType is values[count][3]
+PASS connection.rtt is values[count][4]
+PASS connection.downlink is values[count][5]
+PASS connection.effectiveType is values[count][3]
+PASS connection.rtt is values[count][4]
+PASS connection.downlink is values[count][5]
+PASS connection.effectiveType is values[count][3]
+PASS connection.rtt is values[count][4]
+PASS connection.downlink is values[count][5]
+PASS successfullyParsed is true
+
+TEST COMPLETE
+