Cross-process frames should be notified of device scale factor changes.

content/browser/site_per_process_browsertest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/site_per_process_browsertest.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 43 matching lines @@
 #include "content/test/content_browser_test_utils_internal.h"
 #include "content/test/test_frame_navigation_observer.h"
 #include "ipc/ipc_security_test_util.h"
 #include "net/dns/mock_host_resolver.h"
 #include "net/test/embedded_test_server/embedded_test_server.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/WebKit/public/platform/WebInsecureRequestPolicy.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
 #include "third_party/WebKit/public/web/WebSandboxFlags.h"
 #include "ui/display/display_switches.h"
+#include "ui/display/screen.h"
 #include "ui/events/event.h"
 #include "ui/events/event_utils.h"
 #include "ui/gfx/geometry/point.h"
 
 #if defined(USE_AURA)
 #include "content/browser/renderer_host/render_widget_host_view_aura.h"
 #endif
 
 #if defined(OS_MACOSX)
 #include "ui/base/test/scoped_preferred_scroller_style_mac.h"
@@ skipping 508 matching lines @@
   SetupCrossSiteRedirector(embedded_test_server());
 }
 
 //
 // SitePerProcessHighDPIBrowserTest
 //
 
 
 class SitePerProcessHighDPIBrowserTest : public SitePerProcessBrowserTest {
  public:
+  const double kDeviceScaleFactor = 2.0;
+
   SitePerProcessHighDPIBrowserTest() {}
 
  protected:
   void SetUpCommandLine(base::CommandLine* command_line) override {
     SitePerProcessBrowserTest::SetUpCommandLine(command_line);
-    command_line->AppendSwitchASCII(switches::kForceDeviceScaleFactor,
-                                    base::StringPrintf("2"));
+    command_line->AppendSwitchASCII(
+        switches::kForceDeviceScaleFactor,
+        base::StringPrintf("%f", kDeviceScaleFactor));
   }
 };
 
 // SitePerProcessIgnoreCertErrorsBrowserTest
 
 class SitePerProcessIgnoreCertErrorsBrowserTest
     : public SitePerProcessBrowserTest {
  public:
   SitePerProcessIgnoreCertErrorsBrowserTest() {}
 
  protected:
   void SetUpCommandLine(base::CommandLine* command_line) override {
     SitePerProcessBrowserTest::SetUpCommandLine(command_line);
     command_line->AppendSwitch(switches::kIgnoreCertificateErrors);
   }
 };
 
+double GetFrameDeviceScaleFactor(const ToRenderFrameHost& adapter) {
+  double device_scale_factor;
+  const char kGetFrameDeviceScaleFactor[] =
+      "window.domAutomationController.send(window.devicePixelRatio);";
+  EXPECT_TRUE(ExecuteScriptAndExtractDouble(adapter, kGetFrameDeviceScaleFactor,
+                                            &device_scale_factor));
+  return device_scale_factor;
+}
+
+IN_PROC_BROWSER_TEST_F(SitePerProcessHighDPIBrowserTest,
+                       SubframeLoadsWithCorrectDeviceScaleFactor) {
+  GURL main_url(embedded_test_server()->GetURL(
+      "a.com", "/cross_site_iframe_factory.html?a(b)"));
+  NavigateToURL(shell(), main_url);
+
+  EXPECT_EQ(SitePerProcessHighDPIBrowserTest::kDeviceScaleFactor,
+            GetFrameDeviceScaleFactor(web_contents()));
+
+  FrameTreeNode* root = web_contents()->GetFrameTree()->root();
+  FrameTreeNode* child = root->child_at(0);
+  EXPECT_EQ(SitePerProcessHighDPIBrowserTest::kDeviceScaleFactor,
+            GetFrameDeviceScaleFactor(child));
+}
+
 // Ensure that navigating subframes in --site-per-process mode works and the
 // correct documents are committed.
 #if defined(OS_WIN)
 // This test is flaky on Windows, see https://crbug.com/629419.
 #define MAYBE_CrossSiteIframe DISABLED_CrossSiteIframe
 #else
 #define MAYBE_CrossSiteIframe CrossSiteIframe
 #endif
 IN_PROC_BROWSER_TEST_F(SitePerProcessBrowserTest, MAYBE_CrossSiteIframe) {
   GURL main_url(embedded_test_server()->GetURL(
@@ skipping 7130 matching lines @@
   // https://crbug.com/627893, recreating the opener RenderView was hitting a
   // CHECK(params.swapped_out) in the renderer process, since its
   // RenderViewHost was brought into an active state by the navigation to
   // |stall_url| above, even though it never committed.
   GURL b_url(embedded_test_server()->GetURL("b.com", "/title3.html"));
   EXPECT_TRUE(NavigateToURL(popup_shell, b_url));
   EXPECT_FALSE(rvh->is_active());
 }
 
 }  // namespace content