Make 64-bit Chrome stable report as CHANNEL_STABLE

BUG=407204
TEST=installer_util_unittests
TEST=install x64 stable.  Check chrome://chrome shows 'm' and not 'unknown-m'.

Review URL: https://codereview.chromium.org/467303004

Cr-Commit-Position: refs/heads/master@{#291791}

chrome/installer/util/channel_info.cc

@@ -27,7 +27,8 @@ const wchar_t kSfxMultiFail[] = L"-multifail";
 
 const wchar_t* const kChannels[] = {
   installer::kChromeChannelBeta,
-  installer::kChromeChannelDev
+  installer::kChromeChannelDev,
+  installer::kChromeChannelStableExplicit
 };
 
 const wchar_t* const kModifiers[] = {
@@ -168,7 +169,11 @@ bool ChannelInfo::GetChannelName(std::wstring* channel_name) const {
              *const* end = &kChannels[arraysize(kChannels)]; scan != end;
          ++scan) {
       if (value_.find(*scan) != std::wstring::npos) {
-        channel_name->assign(*scan);
+        // Report channels with "stable" in them as stable (empty string).
+        if (*scan == installer::kChromeChannelStableExplicit)
+          channel_name->erase();
+        else
+          channel_name->assign(*scan);
         return true;
       }
     }

chrome/installer/util/channel_info_unittest.cc

@@ -50,6 +50,16 @@ TEST(ChannelInfoTest, Channels) {
   EXPECT_TRUE(ci.GetChannelName(&channel));
   EXPECT_EQ(kChannelDev, channel);
 
+  ci.set_value(L"x64-dev");
+  EXPECT_TRUE(ci.GetChannelName(&channel));
+  EXPECT_EQ(kChannelDev, channel);
+  ci.set_value(L"x64-beta");
+  EXPECT_TRUE(ci.GetChannelName(&channel));
+  EXPECT_EQ(kChannelBeta, channel);
+  ci.set_value(L"x64-stable");
+  EXPECT_TRUE(ci.GetChannelName(&channel));
+  EXPECT_EQ(kChannelStable, channel);
+
   ci.set_value(L"fuzzy");
   EXPECT_FALSE(ci.GetChannelName(&channel));
 }

chrome/installer/util/util_constants.cc

@@ -263,6 +263,7 @@ const wchar_t kChromeChannelCanary[] = L"canary";
 const wchar_t kChromeChannelDev[] = L"dev";
 const wchar_t kChromeChannelBeta[] = L"beta";
 const wchar_t kChromeChannelStable[] = L"";
+const wchar_t kChromeChannelStableExplicit[] = L"stable";
 
 const size_t kMaxAppModelIdLength = 64U;
 

chrome/installer/util/util_constants.h

@@ -256,6 +256,7 @@ extern const wchar_t kChromeChannelCanary[];
 extern const wchar_t kChromeChannelDev[];
 extern const wchar_t kChromeChannelBeta[];
 extern const wchar_t kChromeChannelStable[];
+extern const wchar_t kChromeChannelStableExplicit[];
 
 extern const size_t kMaxAppModelIdLength;