Convert AwViewMsg_SetInitialPageScale to Mojo

This CL migrates AwViewMsg_SetInitialPageScale to
LocalMainFrame interface.

Bug: 1157124
Change-Id: I2750606e2dfa56d2b0fa2e710510d23333f17304
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2583668
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836409}

android_webview/browser/renderer_host/aw_render_view_host_ext.cc

@@ -88,8 +88,8 @@ void AwRenderViewHostExt::ResetScrollAndScaleState() {
 
 void AwRenderViewHostExt::SetInitialPageScale(double page_scale_factor) {
   DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
-  web_contents()->GetMainFrame()->Send(new AwViewMsg_SetInitialPageScale(
-      web_contents()->GetMainFrame()->GetRoutingID(), page_scale_factor));
+  if (local_main_frame_remote_)
+    local_main_frame_remote_->SetInitialPageScale(page_scale_factor);
 }
 
 void AwRenderViewHostExt::SetBackgroundColor(SkColor c) {

android_webview/common/mojom/frame.mojom

@@ -81,6 +81,10 @@ interface LocalMainFrame {
   // Sets the base background color for this view.
   SetBackgroundColor(skia.mojom.SkColor color);
 
+  // Sets the initial page scale. This overrides initial scale set by
+  // the meta viewport tag.
+  SetInitialPageScale(double page_scale_factor);
+
   // Sets the zoom factor for text only. Used in layout modes other than
   // Text Autosizing.
   SetTextZoomFactor(float zoom_factor);

android_webview/common/render_view_messages.h

@@ -20,11 +20,6 @@
 // RenderView messages
 // These are messages sent from the browser to the renderer process.
 
-// Sets the initial page scale. This overrides initial scale set by
-// the meta viewport tag.
-IPC_MESSAGE_ROUTED1(AwViewMsg_SetInitialPageScale,
-                    double /* page_scale_factor */)
-
 // Tells blink to smooth scroll to the specified location within |duration_ms|.
 IPC_MESSAGE_ROUTED3(AwViewMsg_SmoothScroll,
                     int /* target_x */,

android_webview/renderer/aw_render_frame_ext.cc

@@ -240,7 +240,6 @@ void AwRenderFrameExt::DidCommitProvisionalLoad(
 bool AwRenderFrameExt::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(AwRenderFrameExt, message)
-    IPC_MESSAGE_HANDLER(AwViewMsg_SetInitialPageScale, OnSetInitialPageScale)
     IPC_MESSAGE_HANDLER(AwViewMsg_SmoothScroll, OnSmoothScroll)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
@@ -298,20 +297,20 @@ void AwRenderFrameExt::HitTest(const gfx::PointF& touch_center,
   GetFrameHost()->UpdateHitTestData(std::move(data));
 }
 
-void AwRenderFrameExt::OnSetInitialPageScale(double page_scale_factor) {
+void AwRenderFrameExt::SetBackgroundColor(SkColor c) {
   blink::WebView* webview = GetWebView();
   if (!webview)
     return;
 
-  webview->SetInitialPageScaleOverride(page_scale_factor);
+  webview->SetBaseBackgroundColor(c);
 }
 
-void AwRenderFrameExt::SetBackgroundColor(SkColor c) {
+void AwRenderFrameExt::SetInitialPageScale(double page_scale_factor) {
   blink::WebView* webview = GetWebView();
   if (!webview)
     return;
 
-  webview->SetBaseBackgroundColor(c);
+  webview->SetInitialPageScaleOverride(page_scale_factor);
 }
 
 void AwRenderFrameExt::SetTextZoomFactor(float zoom_factor) {

android_webview/renderer/aw_render_frame_ext.h

@@ -48,12 +48,11 @@ class AwRenderFrameExt : public content::RenderFrameObserver,
   void FocusedElementChanged(const blink::WebElement& element) override;
   void OnDestruct() override;
 
-  void OnSetInitialPageScale(double page_scale_factor);
-
   void OnSmoothScroll(int target_x, int target_y, base::TimeDelta duration);
 
   // mojom::LocalMainFrame overrides:
   void SetBackgroundColor(SkColor c) override;
+  void SetInitialPageScale(double page_scale_factor) override;
   void SetTextZoomFactor(float zoom_factor) override;
   void HitTest(const gfx::PointF& touch_center,
                const gfx::SizeF& touch_area) override;