Re-enable memory tests. Fixed sign-in issue.

Re-recording other tests may be required.

BUG=370977

Review URL: https://codereview.chromium.org/491863003

Cr-Commit-Position: refs/heads/master@{#292168}

tools/perf/benchmarks/memory.py

@@ -7,7 +7,6 @@ import page_sets
 from telemetry import benchmark
 
 
-@benchmark.Disabled('android')  # crbug.com/370977
 class MemoryMobile(benchmark.Benchmark):
   test = memory.Memory
   page_set = page_sets.MobileMemoryPageSet

tools/perf/page_sets/data/mobile_memory.json

 {
     "description": "Describes the Web Page Replay archives for a page set. Don't edit by hand! Use record_wpr for updating.", 
     "archives": {
-        "mobile_memory_017.wpr": [
-            "https://mail.google.com/mail/mu", 
-            "https://www.google.com/search?site=&tbm=isch&q=google", 
-            "http://techcrunch.com", 
+        "mobile_memory_018.wpr": [
             "http://techcrunch.com/2014/02/17/pixel-brings-brings-old-school-video-game-art-to-life-in-your-home/", 
             "http://techcrunch.com/2014/02/15/kickstarter-coins-2/", 
-            "http://techcrunch.com/2014/02/15/was-y-combinator-worth-it/"
+            "http://techcrunch.com/2014/02/15/was-y-combinator-worth-it/", 
+            "https://mail.google.com/mail/mu", 
+            "http://techcrunch.com", 
+            "https://www.google.com/search?site=&tbm=isch&q=google"
         ]
     }
 }
\ No newline at end of file

tools/telemetry/telemetry/core/backends/google_credentials_backend.py

@@ -17,7 +17,11 @@ class GoogleCredentialsBackend(
 
   @property
   def url(self):
-    return 'https://accounts.google.com/'
+    # pylint: disable=C0301
+    # WPR doesn't support having 2 responses for the same URL (with/without
+    # session cookie), so after login behaviour differs with/without wpr.
+    # Sign-in URL is specified directly to overcome this.
+    return 'https://accounts.google.com/ServiceLogin?continue=https%3A%2F%2Faccounts.google.com%2FManageAccount'
 
   @property
   def login_form_id(self):

tools/telemetry/telemetry/core/backends/google_credentials_backend_unittest.py

@@ -12,6 +12,6 @@ class TestGoogleCredentialsBackend(
     self._credentials_type = 'google'
 
   def testLoginUsingMock(self):
-    self._LoginUsingMock(google_credentials_backend.GoogleCredentialsBackend(),
-                         'https://accounts.google.com/', 'Email',
-                         'Passwd')
+    backend = google_credentials_backend.GoogleCredentialsBackend()
+    self._LoginUsingMock(backend, backend.url, backend.login_input_id,
+                         backend.password_input_id)