Rename android_webview::GetChannel

Commit 0c0fc42d moved
AwVariationsServiceClient's "channel == unknown ? stable : channel"
logic into a new android_webview::GetChannel. But this is confusing
because the new GetChannel retains the variations-specific comment, and
the name "android_webview::GetChannel" might sound like all of WebView
should be using this sanitized channel, when UMA still needs the
un-sanitized channel.

Move the variations-specific comment back into AwVariationsServiceClient
and rename GetChannel to GetChannelOrStable.

BUG=758290

Change-Id: I4590aa22b73424e14e47444c3fdf3abc151bf441
Reviewed-on: https://chromium-review.googlesource.com/1187271Reviewed-by: Bo <boliu@chromium.org>
Commit-Queue: Paul Miller <paulmiller@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585662}

android_webview/browser/aw_variations_service_client.cc

@@ -48,7 +48,10 @@ AwVariationsServiceClient::GetNetworkTimeTracker() {
 }
 
 Channel AwVariationsServiceClient::GetChannel() {
-  return android_webview::GetChannel();
+  // Pretend stand-alone WebView is always "stable" for the purpose of
+  // variations. This simplifies experiment design, since stand-alone WebView
+  // need not be considered separately when choosing channels.
+  return android_webview::GetChannelOrStable();
 }
 
 bool AwVariationsServiceClient::GetSupportsPermanentConsistency() {

android_webview/common/aw_channel.cc

@@ -10,13 +10,8 @@ namespace android_webview {
 
 using version_info::Channel;
 
-Channel GetChannel() {
+Channel GetChannelOrStable() {
   Channel channel = version_info::GetChannel();
-  // There are separate Monochrome APKs built for each channel, but only one
-  // stand-alone WebView APK for all channels, so stand-alone WebView has
-  // channel "unknown". Pretend stand-alone WebView is always "stable" for the
-  // purpose of variations. This simplifies experiment design, since stand-alone
-  // WebView need not be considered separately when choosing channels.
   return channel == Channel::UNKNOWN ? Channel::STABLE : channel;
 }
 

android_webview/common/aw_channel.h

@@ -9,7 +9,10 @@
 
 namespace android_webview {
 
-version_info::Channel GetChannel();
+// There are separate Monochrome APKs built for each channel, but only one
+// stand-alone WebView APK for all channels, so stand-alone WebView has channel
+// "unknown". Return the channel if it's known, or "stable" if it's "unknown".
+version_info::Channel GetChannelOrStable();
 
 }  // namespace android_webview
 

android_webview/common/crash_reporter/aw_crash_reporter_client.cc

@@ -73,7 +73,8 @@ class AwCrashReporterClient : public ::crash_reporter::CrashReporterClient {
                                 std::string* channel) override {
     *product_name = "AndroidWebView";
     *version = PRODUCT_VERSION;
-    *channel = version_info::GetChannelString(android_webview::GetChannel());
+    *channel =
+        version_info::GetChannelString(android_webview::GetChannelOrStable());
   }
   // Microdumps are always enabled in WebView builds, conversely to what happens
   // in the case of the other Chrome for Android builds (where they are enabled