LazyLoad: Enable visible load time metrics feature by default

To start with the feature is enabled by default on Android.

Bug: 945036
Change-Id: I9383194f5e10c0bc05834a2e5d3fc50934c22794
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1536681
Commit-Queue: rajendrant <rajendrant@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#644495}

content/public/common/content_features.cc

@@ -232,11 +232,23 @@ const base::Feature kBuiltInModuleInfra{"BuiltInModuleInfra",
 const base::Feature kLazyFrameLoading{"LazyFrameLoading",
                                       base::FEATURE_DISABLED_BY_DEFAULT};
 const base::Feature kLazyFrameVisibleLoadTimeMetrics{
-    "LazyFrameVisibleLoadTimeMetrics", base::FEATURE_DISABLED_BY_DEFAULT};
+  "LazyFrameVisibleLoadTimeMetrics",
+#if defined(OS_ANDROID)
+      base::FEATURE_ENABLED_BY_DEFAULT
+#else
+      base::FEATURE_DISABLED_BY_DEFAULT
+#endif
+};
 const base::Feature kLazyImageLoading{"LazyImageLoading",
                                       base::FEATURE_DISABLED_BY_DEFAULT};
 const base::Feature kLazyImageVisibleLoadTimeMetrics{
-    "LazyImageVisibleLoadTimeMetrics", base::FEATURE_DISABLED_BY_DEFAULT};
+  "LazyImageVisibleLoadTimeMetrics",
+#if defined(OS_ANDROID)
+      base::FEATURE_ENABLED_BY_DEFAULT
+#else
+      base::FEATURE_DISABLED_BY_DEFAULT
+#endif
+};
 
 // Enable lazy initialization of the media controls.
 const base::Feature kLazyInitializeMediaControls{