Removing Page.WaitToLoad and update all pagesets to use explicit wait actions

tools/perf/page_sets/calendar_forward_backward.json

Index: tools/perf/page_sets/calendar_forward_backward.json
diff --git a/tools/perf/page_sets/calendar_forward_backward.json b/tools/perf/page_sets/calendar_forward_backward.json
index 7e5257ff846f1d8f642c65809cd72d3209f5fc4a..5b72a253a8fc997227fb1244cb83272b8da1fbcc 100644
--- a/tools/perf/page_sets/calendar_forward_backward.json
+++ b/tools/perf/page_sets/calendar_forward_backward.json
@@ -8,58 +8,29 @@
       "url": "https://www.google.com/calendar/",
       "why": "Click forward(4x) and backwards(4x) repeatedly",
       "credentials": "google",
-      "wait_for_element_with_selector": "div[class~=\"navForward\"]",
-      "post_navigate_javascript_to_execute": "(function() { var elem = document.createElement('meta');elem.name='viewport';elem.content='initial-scale=1';document.body.appendChild(elem); })();",
-      "wait_seconds": 2,
+      "navigate_steps" : [
+        { "action": "navigate" },
+        { "action": "wait", "seconds": 2 },
+        { "action": "wait", "condition": "element", "selector":  "div[class~=\"navForward\"]" },
+        { "action": "javascript", "expression": "(function() { var elem = document.createElement('meta');elem.name='viewport';elem.content='initial-scale=1';document.body.appendChild(elem); })();" }
+      ],
       "endure": [
-        {
-          "action": "click_element",
-          "selector": "div[class~=\"navForward\"]",
-          "wait_seconds": 2,
-          "wait_for_element_with_selector": "div[class~=\"navForward\"]"
-        },
-        {
-          "action": "click_element",
-          "selector": "div[class~=\"navForward\"]",
-          "wait_seconds": 2,
-          "wait_for_element_with_selector": "div[class~=\"navForward\"]"
-        },
-        {
-          "action": "click_element",
-          "selector": "div[class~=\"navForward\"]",
-          "wait_seconds": 2,
-          "wait_for_element_with_selector": "div[class~=\"navForward\"]"
-        },
-        {
-          "action": "click_element",
-          "selector": "div[class~=\"navForward\"]",
-          "wait_seconds": 2,
-          "wait_for_element_with_selector": "div[class~=\"navBack\"]"
-        },
-        {
-          "action": "click_element",
-          "selector": "div[class~=\"navBack\"]",
-          "wait_seconds": 2,
-          "wait_for_element_with_selector": "div[class~=\"navBack\"]"
-        },
-        {
-          "action": "click_element",
-          "selector": "div[class~=\"navBack\"]",
-          "wait_seconds": 2,
-          "wait_for_element_with_selector": "div[class~=\"navBack\"]"
-        },
-        {
-          "action": "click_element",
-          "selector": "div[class~=\"navBack\"]",
-          "wait_seconds": 2,
-          "wait_for_element_with_selector": "div[class~=\"navBack\"]"
-        },
-        {
-          "action": "click_element",
-          "selector": "div[class~=\"navBack\"]",
-          "wait_seconds": 2,
-          "wait_for_element_with_selector": "div[class~=\"navForward\"]"
-        }
+        { "action": "click_element", "selector": "div[class~=\"navForward\"]" },
+        { "action": "wait", "condition": "element", "selector": "div[class~=\"navForward\"]" },
+        { "action": "click_element", "selector": "div[class~=\"navForward\"]" },
+        { "action": "wait", "condition": "element", "selector": "div[class~=\"navForward\"]" },
+        { "action": "click_element", "selector": "div[class~=\"navForward\"]" },
+        { "action": "wait", "condition": "element", "selector": "div[class~=\"navForward\"]" },
+        { "action": "click_element", "selector": "div[class~=\"navForward\"]" },
+        { "action": "wait", "condition": "element", "selector": "div[class~=\"navBack\"]" },
+        { "action": "click_element", "selector": "div[class~=\"navBack\"]" },
+        { "action": "wait", "condition": "element", "selector": "div[class~=\"navBack\"]" },
+        { "action": "click_element", "selector": "div[class~=\"navBack\"]" },
+        { "action": "wait", "condition": "element", "selector": "div[class~=\"navBack\"]" },
+        { "action": "click_element", "selector": "div[class~=\"navBack\"]" },
+        { "action": "wait", "condition": "element", "selector": "div[class~=\"navBack\"]" },
+        { "action": "click_element", "selector": "div[class~=\"navBack\"]" },
+        { "action": "wait", "condition": "element", "selector": "div[class~=\"navForward\"]" }
       ]
     }
   ]