Add support in Telemetry for specifying exact Android APK

tools/telemetry/telemetry/core/backends/chrome/desktop_browser_finder_unittest.py

Index: tools/telemetry/telemetry/core/backends/chrome/desktop_browser_finder_unittest.py
diff --git a/tools/telemetry/telemetry/core/backends/chrome/desktop_browser_finder_unittest.py b/tools/telemetry/telemetry/core/backends/chrome/desktop_browser_finder_unittest.py
index d03123e20c8151711762fd94673571f1be41db05..8f8dc1f295619b778bf246c36854db9079832101 100644
--- a/tools/telemetry/telemetry/core/backends/chrome/desktop_browser_finder_unittest.py
+++ b/tools/telemetry/telemetry/core/backends/chrome/desktop_browser_finder_unittest.py
@@ -175,6 +175,13 @@ class LinuxFindTest(FindTestBase):
     self._finder_options.browser_executable = '/foo/chrome'
     self.assertIn('exact', self.DoFindAllTypes())
 
+  def testFindWithProvidedApk(self):
+    if not self.CanFindAvailableBrowsers():
+      return
+
+    self._finder_options.browser_executable = '/foo/chrome.apk'
+    self.assertNotIn('exact', self.DoFindAllTypes())
+
   def testFindUsingDefaults(self):
     if not self.CanFindAvailableBrowsers():
       return
@@ -237,3 +244,15 @@ class WinFindTest(FindTestBase):
              'debug', 'release',
              'content-shell-debug', 'content-shell-release',
              'system', 'canary']))
+
+  def testFindAllWithExactApk(self):
+    if not self.CanFindAvailableBrowsers():
+      return
+
+    self._finder_options.browser_executable = 'c:\\tmp\\chrome_shell.apk'
+    types = self.DoFindAllTypes()
+    self.assertEquals(
+        set(types),
+        set(['debug', 'release',
+             'content-shell-debug', 'content-shell-release',
+             'system', 'canary']))