Add method to get Profile from PlatformBrowserTest

For many Autofill and Password Manager tests, the path to getting them
running on Android will require access to Profile from a source other
than browser()-profile().

Adding a method here that follows how content::WebContents is accessed.

Bug: 1127019
Change-Id: I160d6bbc5d0d9437d9a8baef0075ed7566db4425
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2536552Reviewed-by: danakj <danakj@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Ian Struiksma <ianstruiksma@google.com>
Cr-Commit-Position: refs/heads/master@{#828911}

chrome/test/base/chrome_test_utils.cc

@@ -29,4 +29,17 @@ content::WebContents* GetActiveWebContents(PlatformBrowserTest* browser_test) {
 #endif
 }
 
+Profile* GetProfile(PlatformBrowserTest* browser_test) {
+#if defined(OS_ANDROID)
+  for (size_t i = 0; i < TabModelList::size(); ++i) {
+    if (TabModelList::get(i)->IsActiveModel())
+      return TabModelList::get(i)->GetProfile();
+  }
+  NOTREACHED() << "No active TabModel??";
+  return nullptr;
+#else
+  return browser_test->browser()->profile();
+#endif
+}
+
 }  // namespace chrome_test_utils

chrome/test/base/chrome_test_utils.h

@@ -12,6 +12,7 @@
 namespace content {
 class WebContents;
 }
+class Profile;
 
 #if defined(OS_ANDROID)
 #include "chrome/test/base/android/android_browser_test.h"
@@ -27,6 +28,10 @@ namespace chrome_test_utils {
 // window created by tests, more specific behaviour requires other means.
 content::WebContents* GetActiveWebContents(PlatformBrowserTest* browser_test);
 
+// Returns the active Profile. On desktop this is in the first browser
+// window created by tests, more specific behaviour requires other means.
+Profile* GetProfile(PlatformBrowserTest* browser_test);
+
 }  // namespace chrome_test_utils
 
 #endif  // CHROME_TEST_BASE_CHROME_TEST_UTILS_H_