Revert "Removing ICU dependencies from skparagraph BUILD.gn file"

This reverts commit f1711adb1a04595eba1e9984976bfb92d41d0035.

Reason for revert: Build break

Original change's description:
> Removing ICU dependencies from skparagraph BUILD.gn file
> 
> (and from the sources, too)
> 
> Change-Id: I9d8ff51c91aad4b770b1f183c04734d31252b851
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/313148
> Commit-Queue: Julia Lavrova <jlavrova@google.com>
> Reviewed-by: Ben Wagner <bungeman@google.com>

TBR=bungeman@google.com,jlavrova@google.com

Change-Id: I1fce2436855e3e2a4cb7d1d7204b3ae49fd530e8
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/314540
Reviewed-by: Julia Lavrova <jlavrova@google.com>
Commit-Queue: Julia Lavrova <jlavrova@google.com>
diff --git a/modules/skshaper/src/SkUnicode_icu.cpp b/modules/skshaper/src/SkUnicode_icu.cpp
index 13de14d..1a859fe 100644
--- a/modules/skshaper/src/SkUnicode_icu.cpp
+++ b/modules/skshaper/src/SkUnicode_icu.cpp
@@ -4,23 +4,17 @@
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
-#include "include/core/SkString.h"
 #include "include/private/SkTFitsIn.h"
 #include "include/private/SkTemplates.h"
 #include "modules/skshaper/src/SkUnicode.h"
 #include "src/utils/SkUTF.h"
 #include <unicode/ubidi.h>
 #include <unicode/ubrk.h>
-#include <unicode/ustring.h>
 #include <unicode/utext.h>
 #include <unicode/utypes.h>
 #include <vector>
 #include <functional>
 
-#if defined(SK_USING_THIRD_PARTY_ICU)
-#include "SkLoadICU.h"
-#endif
-
 using SkUnicodeBidi = std::unique_ptr<UBiDi, SkFunctionWrapper<decltype(ubidi_close), ubidi_close>>;
 using ICUUText = std::unique_ptr<UText, SkFunctionWrapper<decltype(utext_close), utext_close>>;
 using ICUBreakIterator = std::unique_ptr<UBreakIterator, SkFunctionWrapper<decltype(ubrk_close), ubrk_close>>;
@@ -131,11 +125,23 @@
         }
     }
 
+    static int convertUtf8ToUtf16(const char* utf8, size_t utf8Units, std::unique_ptr<uint16_t[]>* utf16) {
+        int utf16Units = SkUTF::UTF8ToUTF16(nullptr, 0, utf8, utf8Units);
+        if (utf16Units < 0) {
+            SkDEBUGF("Convert error: Invalid utf8 input");
+            return utf16Units;
+        }
+        *utf16 = std::unique_ptr<uint16_t[]>(new uint16_t[utf16Units]);
+        SkDEBUGCODE(int dstLen =) SkUTF::UTF8ToUTF16(utf16->get(), utf16Units, utf8, utf8Units);
+        SkASSERT(dstLen == utf16Units);
+        return utf16Units;
+    }
+
     static bool extractBidi(const char utf8[], int utf8Units, TextDirection dir, std::vector<BidiRegion>* bidiRegions) {
 
         // Convert to UTF16 since for now bidi iterator only operates on utf16
         std::unique_ptr<uint16_t[]> utf16;
-        auto utf16Units = utf8ToUtf16(utf8, utf8Units, &utf16);
+        auto utf16Units = convertUtf8ToUtf16(utf8, utf8Units, &utf16);
         if (utf16Units < 0) {
             return false;
         }
@@ -270,29 +276,6 @@
         return true;
     }
 
-    static int utf8ToUtf16(const char* utf8, size_t utf8Units, std::unique_ptr<uint16_t[]>* utf16) {
-        int utf16Units = SkUTF::UTF8ToUTF16(nullptr, 0, utf8, utf8Units);
-        if (utf16Units < 0) {
-            SkDEBUGF("Convert error: Invalid utf8 input");
-            return utf16Units;
-        }
-        *utf16 = std::unique_ptr<uint16_t[]>(new uint16_t[utf16Units]);
-        SkDEBUGCODE(int dstLen =) SkUTF::UTF8ToUTF16(utf16->get(), utf16Units, utf8, utf8Units);
-        SkASSERT(dstLen == utf16Units);
-        return utf16Units;
-   }
-
-    static int utf16ToUtf8(const uint16_t* utf16, size_t utf16Units, std::unique_ptr<char[]>* utf8) {
-        int utf8Units = SkUTF::UTF16ToUTF8(nullptr, 0, utf16, utf16Units);
-        if (utf8Units < 0) {
-            SkDEBUGF("Convert error: Invalid utf16 input");
-            return utf8Units;
-        }
-        *utf8 = std::unique_ptr<char[]>(new char[utf8Units]);
-        SkDEBUGCODE(int dstLen =) SkUTF::UTF16ToUTF8(utf8->get(), utf8Units, utf16, utf16Units);
-        SkASSERT(dstLen == utf8Units);
-        return utf8Units;
-   }
 public:
     ~SkUnicode_icu() override { }
     std::unique_ptr<SkBidiIterator> makeBidiIterator(const uint16_t text[], int count,
@@ -304,25 +287,6 @@
         return SkBidiIterator_icu::makeBidiIterator(text, count, dir);
     }
 
-    // TODO: Use ICU data file to detect controls and whitespaces
-    bool isControl(SkUnichar utf8) override {
-        return u_iscntrl(utf8);
-    }
-
-    bool isWhitespace(SkUnichar utf8) override {
-        return u_isWhitespace(utf8);
-    }
-
-    SkString convertUtf16ToUtf8(const std::u16string& utf16) override {
-        std::unique_ptr<char[]> utf8;
-        auto utf8Units = SkUnicode_icu::utf16ToUtf8((uint16_t*)utf16.data(), utf16.size(), &utf8);
-        if (utf8Units >= 0) {
-            return SkString(utf8.get(), utf8Units);
-        } else {
-            return SkString();
-        }
-    }
-
     bool getBidiRegions(const char utf8[], int utf8Units, TextDirection dir, std::vector<BidiRegion>* results) override {
         return extractBidi(utf8, utf8Units, dir, results);
     }
@@ -341,7 +305,7 @@
 
         // Convert to UTF16 since we want the results in utf16
         std::unique_ptr<uint16_t[]> utf16;
-        auto utf16Units = utf8ToUtf16(utf8, utf8Units, &utf16);
+        auto utf16Units = convertUtf8ToUtf16(utf8, utf8Units, &utf16);
         if (utf16Units < 0) {
             return false;
         }
@@ -366,12 +330,4 @@
     }
 };
 
-std::unique_ptr<SkUnicode> SkUnicode::Make() {
-    #if defined(SK_USING_THIRD_PARTY_ICU)
-    if (!SkLoadICU()) {
-        SkDEBUGF("SkLoadICU() failed!\n");
-        return nullptr;
-    }
-    #endif
-    return std::make_unique<SkUnicode_icu>();
-}
+std::unique_ptr<SkUnicode> SkUnicode::Make() { return std::make_unique<SkUnicode_icu>(); }