Adds Server Previews protocol UMA plus UMA for not accepting previews

components/data_reduction_proxy/core/browser/data_reduction_proxy_network_delegate_unittest.cc

Index: components/data_reduction_proxy/core/browser/data_reduction_proxy_network_delegate_unittest.cc
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_network_delegate_unittest.cc b/components/data_reduction_proxy/core/browser/data_reduction_proxy_network_delegate_unittest.cc
index e80b933ab9e93f0ba690aae0dd53614c0e346f49..dba17a0559f50d23adc33892e5834b191a9d7510 100644
--- a/components/data_reduction_proxy/core/browser/data_reduction_proxy_network_delegate_unittest.cc
+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_network_delegate_unittest.cc
@@ -242,7 +242,8 @@ class TestLoFiDecider : public LoFiDecider {
     std::string header_value;
     if (headers.GetHeader(chrome_proxy_accept_transform_header(),
                           &header_value)) {
-      return header_value == empty_image_directive();
+      return header_value == empty_image_directive() ||
+             header_value == lite_page_directive();
     }
     return false;
   }
@@ -2164,6 +2165,89 @@ TEST_F(DataReductionProxyNetworkDelegateClientLoFiTest, DataSavingsThroughDRP) {
             GetSavings());
 }
 
+TEST_F(DataReductionProxyNetworkDelegateTest, TestAcceptTransformHistogram) {
+  Init(USE_INSECURE_PROXY, false);
+  base::HistogramTester histogram_tester;
+
+  // Verify lite page request.
+  net::HttpRequestHeaders request_headers;
+  request_headers.SetHeader("chrome-proxy-accept-transform", "lite-page");
+  FetchURLRequest(GURL(kTestURL), &request_headers, std::string(), 140, 0);
+  histogram_tester.ExpectTotalCount(
+      "DataReductionProxy.Protocol.AcceptTransform", 1);
+  histogram_tester.ExpectBucketCount(
+      "DataReductionProxy.Protocol.AcceptTransform",
+      0 /* LITE_PAGE_REQUESTED */, 1);
+  // Check legacy histogram too:
+  histogram_tester.ExpectBucketCount(
+      "DataReductionProxy.LoFi.TransformationType",
+      NO_TRANSFORMATION_LITE_PAGE_REQUESTED, 1);
+
+  // Verify empty image request.
+  request_headers.SetHeader("chrome-proxy-accept-transform", "empty-image");
+  FetchURLRequest(GURL(kTestURL), &request_headers, std::string(), 140, 0);
+  histogram_tester.ExpectTotalCount(
+      "DataReductionProxy.Protocol.AcceptTransform", 2);
+  histogram_tester.ExpectBucketCount(
+      "DataReductionProxy.Protocol.AcceptTransform",
+      3 /* EMPTY_IMAGE_REQUESTED */, 1);
+
+  // Verify lite page response.
+  std::string response_headers =
+      "HTTP/1.1 200 OK\r\n"
+      "Chrome-Proxy-Content-Transform: lite-page\r\n"
+      "Date: Wed, 28 Nov 2007 09:40:09 GMT\r\n"
+      "Expires: Mon, 24 Nov 2014 12:45:26 GMT\r\n"
+      "Via: 1.1 Chrome-Compression-Proxy\r\n"
+      "x-original-content-length: 200\r\n"
+      "\r\n";
+  auto request =
+      FetchURLRequest(GURL(kTestURL), nullptr, response_headers, 140, 0);
+  EXPECT_TRUE(DataReductionProxyData::GetData(*request)->lite_page_received());
+  histogram_tester.ExpectTotalCount(
+      "DataReductionProxy.Protocol.AcceptTransform", 3);
+  histogram_tester.ExpectBucketCount(
+      "DataReductionProxy.Protocol.AcceptTransform",
+      1 /* LITE_PAGE_TRANSFORM_RECEIVED */, 1);
+  // Check legacy histogram too:
+  histogram_tester.ExpectBucketCount(
+      "DataReductionProxy.LoFi.TransformationType", LITE_PAGE, 1);
+
+  // Verify page policy response.
+  response_headers =
+      "HTTP/1.1 200 OK\r\n"
+      "Chrome-Proxy: page-policies=empty-image\r\n"
+      "Date: Wed, 28 Nov 2007 09:40:09 GMT\r\n"
+      "Expires: Mon, 24 Nov 2014 12:45:26 GMT\r\n"
+      "Via: 1.1 Chrome-Compression-Proxy\r\n"
+      "x-original-content-length: 200\r\n"
+      "\r\n";
+  request = FetchURLRequest(GURL(kTestURL), nullptr, response_headers, 140, 0);
+  EXPECT_FALSE(DataReductionProxyData::GetData(*request)->lite_page_received());
+  histogram_tester.ExpectTotalCount(
+      "DataReductionProxy.Protocol.AcceptTransform", 4);
+  histogram_tester.ExpectBucketCount(
+      "DataReductionProxy.Protocol.AcceptTransform",
+      2 /* EMPTY_IMAGE_POLICY_DIRECTIVE_RECEIVED */, 1);
+
+  // Verify empty image response.
+  response_headers =
+      "HTTP/1.1 200 OK\r\n"
+      "Chrome-Proxy-Content-Transform: empty-image\r\n"
+      "Date: Wed, 28 Nov 2007 09:40:09 GMT\r\n"
+      "Expires: Mon, 24 Nov 2014 12:45:26 GMT\r\n"
+      "Via: 1.1 Chrome-Compression-Proxy\r\n"
+      "x-original-content-length: 200\r\n"
+      "\r\n";
+  request = FetchURLRequest(GURL(kTestURL), nullptr, response_headers, 140, 0);
+  EXPECT_TRUE(DataReductionProxyData::GetData(*request)->lofi_received());
+  histogram_tester.ExpectTotalCount(
+      "DataReductionProxy.Protocol.AcceptTransform", 5);
+  histogram_tester.ExpectBucketCount(
+      "DataReductionProxy.Protocol.AcceptTransform",
+      4 /* EMPTY_IMAGE_TRANSFORM_RECEIVED */, 1);
+}
+
 }  // namespace
 
 }  // namespace data_reduction_proxy