Adding pagesets for gmail and plus. Creating endure benchmark

tools/perf/page_sets/gmail_expand_collapse_conversation.json

Index: tools/perf/page_sets/gmail_expand_collapse_conversation.json
diff --git a/tools/perf/page_sets/gmail_expand_collapse_conversation.json b/tools/perf/page_sets/gmail_expand_collapse_conversation.json
new file mode 100644
index 0000000000000000000000000000000000000000..e03105ac494e4ed0d8484c3e7c04542b49289461
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+++ b/tools/perf/page_sets/gmail_expand_collapse_conversation.json
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+{
+  "description": "Chrome Endure test for GMail.",
+  "archive_data_file": "../data/gmail_expand_collapse_conversation.json",
+  "credentials_path": "../data/credentials.json",
+  "user_agent_type": "desktop",
+  "pages": [
+    {
+      "url": "https://mail.google.com/mail/u/0/#inbox/13c6a141fa95ffe0",
+      "why": "Expand and Collapse a long conversation. # TODO(edmundyan): Find a long conversation rather than hardcode url",
+      "credentials": "google",
+      "navigate_steps": [
+        { "action": "navigate" },
+        { "action": "wait", "condition": "element", "selector": "img[alt=\"Expand all\"]" },
+        { "action": "click_element", "selector": "img[alt=\"Expand all\"]" },
+        { "action": "wait", "seconds": 5 },
+        { "action": "wait", "condition": "element", "selector": "img[alt=\"Collapse all\"]" },
+        { "action": "click_element", "selector": "img[alt=\"Collapse all\"]" },
+        { "action": "wait", "seconds": 1 }
+      ],
+      "endure": [
+        { "action": "wait", "condition": "element", "selector": "img[alt=\"Expand all\"]" },
+        { "action": "click_element", "selector": "img[alt=\"Expand all\"]" },
+        { "action": "wait", "seconds": 1 },
+        { "action": "wait", "condition": "element", "selector": "img[alt=\"Collapse all\"]" },
+        { "action": "click_element", "selector": "img[alt=\"Collapse all\"]" },
+        { "action": "wait", "seconds": 1 }
+      ]
+    }
+  ]
+}