[Android] Add spellchecking support in android_webview.

Add spellcheck functionality to webview. Spellchecking
feature will be enabled if the kEnableAndroidSpellChecker
flag is present.

Historical note:
Blink used to have unified_textchecker_enabled setting
which was false by default in android webview and
needed to be enabled in order for spellchecking to work.
It was recently removed in
https://codereview.chromium.org/2235643002/ though.

BUG=583616, 629609

Review-Url: https://codereview.chromium.org/2264633002
Cr-Commit-Position: refs/heads/master@{#414331}

android_webview/BUILD.gn

@@ -630,6 +630,13 @@ source_set("common") {
     ]
   }
 
+  if (enable_spellcheck) {
+    deps += [
+      "//components/spellcheck/browser",
+      "//components/spellcheck/renderer",
+    ]
+  }
+
   configs += [ "//v8:external_startup_data" ]
 }
 
@@ -719,6 +726,10 @@ android_library("android_webview_java") {
     deps += [ "//components/policy/android:policy_java" ]
   }
 
+  if (enable_spellcheck) {
+    deps += [ "//components/spellcheck/browser/android:java" ]
+  }
+
   srcjar_deps = [ "//android_webview/native:aw_permission_request_resource" ]
 }
 

android_webview/browser/DEPS

@@ -20,6 +20,8 @@ include_rules = [
   "+components/pref_registry",
   "+components/printing/browser",
   "+components/printing/common",
+  "+components/spellcheck/browser",
+  "+components/spellcheck/common",
   "+components/url_formatter",
   "+components/user_prefs",
   "+components/visitedlink/browser",

android_webview/browser/aw_content_browser_client.cc

@@ -55,6 +55,11 @@
 #include "ui/base/resource/resource_bundle_android.h"
 #include "ui/resources/grit/ui_resources.h"
 
+#if defined(ENABLE_SPELLCHECK)
+#include "components/spellcheck/browser/spellcheck_message_filter_platform.h"
+#include "components/spellcheck/common/spellcheck_switches.h"
+#endif
+
 using content::BrowserThread;
 using content::ResourceType;
 
@@ -218,6 +223,13 @@ void AwContentBrowserClient::RenderProcessWillLaunch(
   host->AddFilter(new AwContentsMessageFilter(host->GetID()));
   host->AddFilter(new cdm::CdmMessageFilterAndroid());
   host->AddFilter(new AwPrintingMessageFilter(host->GetID()));
+
+#if defined(ENABLE_SPELLCHECK)
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+      spellcheck::switches::kEnableAndroidSpellChecker)) {
+    host->AddFilter(new SpellCheckMessageFilterPlatform(host->GetID()));
+  }
+#endif
 }
 
 bool AwContentBrowserClient::IsHandledURL(const GURL& url) {

android_webview/native/BUILD.gn

@@ -118,6 +118,10 @@ source_set("native") {
     deps += [ "//components/external_video_surface:external_video_surface" ]
   }
 
+  if (enable_spellcheck) {
+    deps += [ "//components/spellcheck/browser:browser" ]
+  }
+
   libs = [ "jnigraphics" ]
 }
 

android_webview/native/DEPS

@@ -14,6 +14,7 @@ include_rules = [
   "+components/devtools_http_handler",
   "+components/external_video_surface",
   "+components/navigation_interception",
+  "+components/spellcheck/browser/android",
   "+components/user_prefs",
   "+components/web_contents_delegate_android",
 

android_webview/native/android_webview_jni_registrar.cc

@@ -27,6 +27,10 @@
 #include "base/android/jni_registrar.h"
 #include "base/trace_event/trace_event.h"
 
+#if defined(ENABLE_SPELLCHECK)
+#include "components/spellcheck/browser/android/component_jni_registrar.h"
+#endif
+
 namespace android_webview {
 
 static base::android::RegistrationMethod kWebViewRegisteredMethods[] = {
@@ -50,6 +54,9 @@ static base::android::RegistrationMethod kWebViewRegisteredMethods[] = {
   { "CookieManager", RegisterCookieManager },
   { "AwMessagePortService", RegisterAwMessagePortService },
   { "AwGLFunctor", RegisterAwGLFunctor },
+#if defined(ENABLE_SPELLCHECK)
+  {"SpellCheckerSessionBridge", spellcheck::android::RegisterSpellcheckJni},
+#endif
 };
 
 bool RegisterJni(JNIEnv* env) {

android_webview/renderer/DEPS

@@ -8,6 +8,7 @@ include_rules = [
   "+components/cdm/renderer",
   "+components/printing/common",
   "+components/printing/renderer",
+  "+components/spellcheck/renderer",
   "+components/visitedlink/renderer",
 
   "+content/public/child",

android_webview/renderer/aw_content_renderer_client.cc

@@ -52,6 +52,11 @@
 #include "url/gurl.h"
 #include "url/url_constants.h"
 
+#if defined(ENABLE_SPELLCHECK)
+#include "components/spellcheck/renderer/spellcheck.h"
+#include "components/spellcheck/renderer/spellcheck_provider.h"
+#endif
+
 using content::RenderThread;
 
 namespace android_webview {
@@ -74,6 +79,13 @@ void AwContentRendererClient::RenderThreadStarted() {
   blink::WebString aw_scheme(
       base::ASCIIToUTF16(android_webview::kAndroidWebViewVideoPosterScheme));
   blink::WebSecurityPolicy::registerURLSchemeAsSecure(aw_scheme);
+
+#if defined(ENABLE_SPELLCHECK)
+  if (!spellcheck_) {
+    spellcheck_ = base::MakeUnique<SpellCheck>();
+    thread->AddObserver(spellcheck_.get());
+  }
+#endif
 }
 
 bool AwContentRendererClient::HandleNavigation(
@@ -163,6 +175,10 @@ void AwContentRendererClient::RenderViewCreated(
   new printing::PrintWebViewHelper(
       render_view, std::unique_ptr<printing::PrintWebViewHelper::Delegate>(
                        new AwPrintWebViewHelperDelegate()));
+
+#if defined(ENABLE_SPELLCHECK)
+  new SpellCheckProvider(render_view, spellcheck_.get());
+#endif
 }
 
 bool AwContentRendererClient::HasErrorPage(int http_status_code,

android_webview/renderer/aw_content_renderer_client.h

@@ -14,6 +14,11 @@
 #include "components/web_restrictions/interfaces/web_restrictions.mojom.h"
 #include "content/public/renderer/content_renderer_client.h"
 
+#if defined(ENABLE_SPELLCHECK)
+class SpellCheck;
+class SpellCheckProvider;
+#endif
+
 namespace visitedlink {
 class VisitedLinkSlave;
 }
@@ -57,6 +62,10 @@ class AwContentRendererClient : public content::ContentRendererClient {
   std::unique_ptr<visitedlink::VisitedLinkSlave> visited_link_slave_;
   web_restrictions::mojom::WebRestrictionsPtr web_restrictions_service_;
 
+#if defined(ENABLE_SPELLCHECK)
+  std::unique_ptr<SpellCheck> spellcheck_;
+#endif
+
   DISALLOW_COPY_AND_ASSIGN(AwContentRendererClient);
 };