Ozone/Linux: use pangocairo and fix *TrueTypeFont tests

This fixes *TrueTypeFont tests. Maybe, we want to use something
else than pangocairo. A bug to track that has been created.

PS: it's important to fix this now as long as use_x11 && use_ozone
config breaks the above mentioned tests on linux-rel bot then.

Bug: 1119772
Change-Id: I14a01e623a84510d8398171a58ecf45840f58a5f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2366901Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Maksim Sisov (GMT+3) <msisov@igalia.com>
Cr-Commit-Position: refs/heads/master@{#800929}

content/browser/BUILD.gn

@@ -2349,11 +2349,20 @@ source_set("browser") {
       "//ppapi/proxy:ipc",
       "//ppapi/shared_impl",
     ]
-    if (use_ozone) {
+
+    # TODO(1119772): this makes both use_x11 and use_ozone builds for is_linux use
+    # pangocairo so that PPAPINaClNewlibTest.TrueTypeFont,
+    # PPAPINaClPNaClNonSfiTest.TrueTypeFont, and OutOfProcessPPAPITest.TrueTypeFont
+    # tests continue to run normally on Linux. This also fixes these tests for
+    # Ozone/Linux, but requires to use pangocairo. We probably want to continue
+    # using pango on Linux and switch to something else for other systems that
+    # use Ozone.
+    if (use_ozone && !is_desktop_linux) {
       sources += [ "renderer_host/pepper/pepper_truetype_font_list_ozone.cc" ]
     } else if (use_pangocairo) {
       sources += [ "renderer_host/pepper/pepper_truetype_font_list_pango.cc" ]
     }
+
     if (is_linux || is_chromeos) {
       deps += [ "//components/services/font:ppapi_fontconfig_matching" ]
     }

testing/buildbot/filters/ozone-linux.wayland_browser_tests.filter

@@ -16,8 +16,6 @@
 -OmniboxPopupContentsViewTest.ClickOmnibox
 -OmniboxPopupContentsViewTest.PopupMatchesLocationBarBackground
 -OutOfProcessPPAPITest.FlashClipboard
--PPAPINaClNewlibTest.TrueTypeFont
--PPAPINaClPNaClNonSfiTest.TrueTypeFont
 -PageInfoBubbleViewBrowserTest.FocusDoesNotReturnToContentsOnReloadPrompt
 -PageInfoBubbleViewBrowserTest.FocusReturnsToContentOnClose
 -PaymentRequestCreditCardEditorTest.EditingExpiredCard

testing/buildbot/filters/ozone-linux.wayland_content_browsertests.filter

@@ -3,4 +3,3 @@
 -All/AuraWindowVideoCaptureDeviceBrowserTestP.CapturesContentChanges/3
 -EventLatencyBrowserTest.KeyPressOnButton
 -EventLatencyBrowserTest.KeyPressOnButtonWithAnimation
--OutOfProcessPPAPITest.TrueTypeFont

testing/buildbot/filters/ozone-linux.x11_browser_tests.filter

@@ -3,8 +3,6 @@
 # Failed
 -DesktopCaptureApiTest.ChooseDesktopMedia
 -OutOfProcessPPAPITest.FlashClipboard
--PPAPINaClNewlibTest.TrueTypeFont
--PPAPINaClPNaClNonSfiTest.TrueTypeFont
 -WebRtcDesktopCaptureBrowserTest.RunsScreenshareFromOneTabToAnother
 -WebRtcGetDisplayMediaBrowserTestWithPicker.GetDisplayMediaVideo
 -WebRtcGetDisplayMediaBrowserTestWithPicker.GetDisplayMediaVideoAndAudio

testing/buildbot/filters/ozone-linux.x11_content_browsertests.filter

 # Fix these failures: https://crbug.com/1040382
 
-# Failing tests
--OutOfProcessPPAPITest.TrueTypeFont
-
 # Crashing tests
 -TouchSelectionForCrossProcessFramesTests/TouchSelectionControllerClientAuraSiteIsolationTest.BasicSelectionIsolatedIframe/0
 -TouchSelectionForCrossProcessFramesTests/TouchSelectionControllerClientAuraSiteIsolationTest.BasicSelectionIsolatedIframe/1