[Telemetry] Add test case for power usage of background animations/heavy tab.

tools/perf/page_sets/tough_energy_cases.json

Index: tools/perf/page_sets/tough_energy_cases.json
diff --git a/tools/perf/page_sets/tough_energy_cases.json b/tools/perf/page_sets/tough_energy_cases.json
new file mode 100644
index 0000000000000000000000000000000000000000..f9654494ee238ee616719ea762ee6103a3dd13d1
--- /dev/null
+++ b/tools/perf/page_sets/tough_energy_cases.json
@@ -0,0 +1,22 @@
+{
+  "description": "Pages for measuring Chrome power draw.",
+  "archive_data_file": "data/tough_energy_cases.json",
+  "credentials_path": "data/credentials.json",
+  "pages": [
+    { "url": "file://tough_energy_cases/above-fold-animated-gif.html",
+      "why": "Above the fold animated gif running in the background"},
+    {
+      "url": "https://mail.google.com/mail/",
+      "why": "productivity, top google properties",
+      "credentials": "google",
+      "navigate_steps" : [
+        { "action": "navigate" },
+        { "action": "wait", "javascript": "window.gmonkey !== undefined && document.getElementById('gb') !== null" }
+      ]
+    },
+    { "url": "file://tough_energy_cases/below-fold-animated-gif.html",
+      "why": "Below the fold animated gif" },
+    { "url": "file://tough_energy_cases/below-fold-flash.html",
+      "why": "Below the fold flash animation" }
+  ]
+}