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));
+}
+
+class DisplayMetricsChangedObserver : public display::DisplayObserver {
+ public:
+  DisplayMetricsChangedObserver(uint32_t metrics_flags)
+      : metrics_flags_(metrics_flags), device_scale_factor_changed_(false) {}
+
+  void OnDisplayAdded(const display::Display&) override {}
+  void OnDisplayRemoved(const display::Display&) override {}
+
+  void OnDisplayMetricsChanged(const display::Display& display,
+                               uint32_t changed_metrics) override {
+    if ((changed_metrics & metrics_flags_) == metrics_flags_) {
+      device_scale_factor_changed_ = true;
+
+      if (!message_loop_runner_)
+        return;
+
+      message_loop_runner_->Quit();
+    }
+  }
+
+  void WaitForDeviceScaleFactorChanged() {
+    if (device_scale_factor_changed_)
+      return;
+
+    message_loop_runner_ = new MessageLoopRunner;
+    message_loop_runner_->Run();
+  }
+
+ private:
+  uint32_t metrics_flags_;
+  bool device_scale_factor_changed_;
+  scoped_refptr<MessageLoopRunner> message_loop_runner_;
+
+  DISALLOW_COPY_AND_ASSIGN(DisplayMetricsChangedObserver);
+};
+
+IN_PROC_BROWSER_TEST_F(SitePerProcessBrowserTest,
+                       DeviceScaleFactorChangePropagatesToAllFrames) {
+  GURL main_url(embedded_test_server()->GetURL(
+      "a.com", "/cross_site_iframe_factory.html?a(b)"));
+  NavigateToURL(shell(), main_url);
+
+  EXPECT_EQ(1.0, GetFrameDeviceScaleFactor(web_contents()));
+
+  FrameTreeNode* root = web_contents()->GetFrameTree()->root();
+  FrameTreeNode* child = root->child_at(0);
+  EXPECT_EQ(1.0, GetFrameDeviceScaleFactor(child));
+
+  display::Screen* screen = display::Screen::GetScreen();
+
+  float new_device_scale_factor = 2.5f;
+  {
+    DisplayMetricsChangedObserver observer(
+        display::DisplayObserver::DISPLAY_METRIC_DEVICE_SCALE_FACTOR);
+    screen->AddObserver(&observer);
+    screen->SetDeviceScaleFactorForTest(new_device_scale_factor);
+    observer.WaitForDeviceScaleFactorChanged();
+    screen->RemoveObserver(&observer);
+  }
+  EXPECT_EQ(new_device_scale_factor, GetFrameDeviceScaleFactor(web_contents()));
+  EXPECT_EQ(new_device_scale_factor, 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 7049 matching lines @@
             root_frame_monitor.events_received()[5]);
   EXPECT_EQ(blink::WebInputEvent::GestureScrollEnd,
             root_frame_monitor.events_received()[6]);
 
   // Verify child-RWHI gets no events.
   EXPECT_FALSE(child_frame_monitor.EventWasReceived());
 }
 #endif
 
 }  // namespace content